CS-2009 SSc8: Light Pollution Reduction

  • NC CS- SSc8 Light Pollution Reduction- Credit Requirements
  • Interior and exterior lighting

    Addressing both interior and exterior lighting, this credit seeks to reduce light pollution that can block our view of the night sky and cause human health problems as well as ecological problems for many birds, insects, and other animals. Light pollution often represents nighttime lighting that isn’t needed, wasting energy while causing light trespass and contrast, reducing visibility.

    SSc8 YouTube video

    Better lighting = Better safety, less energy

    Many people think that more lighting means better nighttime safety and security. However, too much exterior lighting can make outdoor and parking areas less safe by creating high contrast between lit and unlit spaces. Among other problems, when the human eye is flooded by bright light, it becomes harder to adjust to darker areas and shadows. Too much exterior lighting also means unnecessary energy consumption. Some objectives to keep in mind when striving for safe, efficient, and aesthetically pleasing lighting design are lighting uniformity, low contrast, no glare, and preventing light from spilling off the site. This can be achieved through judicious selection of fixtures with full cutoffA full cutoff luminaire has zero candela intensity at an angle of 90 degrees above the vertical axis (nadir or straight down) and at all angles greater than 90 degrees from straight down. Additionally, the candela per 1,000 lamp lumens does not numerically exceed 100 (10%) at an angle of 80 degrees above nadir. This applies to all lateral angles around the luminaire. that direct light toward the ground but prevent it from shining up into the night sky.

    Full-cutoff luminaires reduce light pollution, improving views of the night sky.

    The four requirements can make it complicated

    This credit has four separate requirements, which can make compliance complicated—though not necessarily difficult. One addresses indoor lighting spilling to the outdoors, and three deal with exterior lighting, including façade lighting, site lighting of areas like pathways and parking lots. In most circumstances, these requirements are relatively easy and cost-neutral to meet. The biggest challenge often comes in dealing with light-trespass limits—light bleeding off the project site into a neighboring site—on projects with small or constrained sites. You will also need to attain low lighting power densities per ASHRAE 90.1-2007, which is a good general practice and won’t require you to compromise on aesthetics or cost.

    LEED boundary is important

    You’ll need to pay careful attention to establishing a LEED project boundary, which plays an important part in meeting light trespass requirements. Involve an exterior lighting designer (or landscape architect) early in the design process to develop photometric plans and guide fixture selection during design.

    FAQs for SSc8

    Are residential spaces exempt from the interior lighting calculations?

    Yes, as of 4/1/12 per LEED for Homes 2008 Interpretation #10147, “residential spaces (dwelling units only) within the scope of other LEED projects are also exempt from the interior lighting requirements.”

    Do existing fixtures need to be included in the exterior lighting calculations?

    Yes, if they are within the LEED project boundary.

    Can the Application Guide for Multiple Buildings and On-Campus Building Projects be used for the exterior lighting requirements?

    Yes, as long as the entire site meets the requirements.

    Can a mix of Option 1 (opaque surfaces) and Option 2 (automatic controls) be used to meet the interior lighting requirements?

    Yes.

    Are hospitals exempt from interior lighting requirements?

    No, hospitals are not exempt from the interior lighting requirements.

    What effect did the November 2011 ASHRAE table 9.4.6 Addendum i have on exterior lighting power allowances?

    Significant reductions for tradable surfaces in LZ1 and LZ2 and some in LZ3. See the new table for details. It also added lighting power allowances according to light zones, removed a 5% adder, and introduced a base site allowance. Suggest revising response and adding a link to the Addendum i available for free download on ASHRAE website.

    What about zero lot line projects, where is the boundary?

    You can use the curb line.

    To calculate building façade lighting power density, how do you determine the area used in the calculation?

    Use only the area that has measurable light on the surface; baseline and proposed are the same.

    Where are vertical footcandles measured at the site boundary?

    At grade level.

    Is signage included in the LPD calculations for building façades?

    No, per ASHRAE table 9.4.5, you can exclude lights in display windows, advertising, and directional signs as long as they are switched separately from other lighting.

    Does uplight that is under a canopy count towards the limitation of total initial design fixture lumens at 90 degrees or higher from nadir?

    If the canopy blocks 100% of the light then yes, but this is unlikely. Any light spillage needs to be counted toward the uplighting limit, but calculating this can be difficult. Using downlights is recommended instead.

    Is flag lighting exempt from this credit?

    Not currently, but USGBC is looking at exempting flag lighting from LEED v4 requirements.

    Are city-owned lights within a project's property required to comply with credit requirements?

    According to LEED InterpretationLEED Interpretations are official answers to technical inquiries about implementing LEED on a project. They help people understand how their projects can meet LEED requirements and provide clarity on existing options. LEED Interpretations are to be used by any project certifying under an applicable rating system. All project teams are required to adhere to all LEED Interpretations posted before their registration date. This also applies to other addenda. Adherence to rulings posted after a project registers is optional, but strongly encouraged. LEED Interpretations are published in a searchable database at usgbc.org. #10236, street lighting that is required by the governmental authorities to be installed within the LEED project’s lighting boundary (whether existing or new) does not need to be included in any of the calculations.

    For campus projects, do all existing light fixtures need to comply with credit requirements at the time of a project's submittal?

    All existing fixtures within the LEED project boundary would need to comply with the SSc8 requirements at the time the project is submitted for review. However, if the project elected to use the campus property boundary as the "lighting boundary" for SSc8 as allowed by LEED Interpretation #10236, existing fixtures within the lighting boundary, but outside the specific LEED project boundary would not have to comply with any of the SSc8 requirements. Essentially, the "lighting boundary" is only used in such circumstances for evaluating that the light trespass requirements are met at that boundary by lighting located within the LEED project boundary.

    What advertising lights or signs must comply with credit requirements and which are exempt?

    Advertising and directional signage, as explained in Addendum i of ASHRAE 90.1-2007, and further defined in the Users Manual for ASHRAE 90.1-2007, is exempt.  Essentially, that means that internally illuminated advertising signs are exempt, but those illuminated by lighting that is not ‘integral’ to the signage itself must be included in the calculations.

Legend

  • Best Practices
  • Gotcha
  • Action Steps
  • Cost Tip

Pre-Design

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  • Designate one responsible party to oversee exterior lighting-related LEED credit requirements. For large projects, this person may be the civil engineer or landscape architect. For small projects it may be the architect, lighting designer, or other relevant team member.


  • Identify the building owner’s goals for occupant safety and comfort as well as for architectural lighting, including façade lighting. Include these goals in the Owners Project Requirements for EAp1: Fundamental Commissioning


  • One of the biggest barriers to reducing light pollution is the cultural and aesthetic affinity for brightly lit buildings. Owners can play an important leadership role in contending with these expectations, establishing aesthetic goals that do not include excess lighting for purely aesthetic purposes. The design team can play an important role by maintaining low levels of lighting and highlighting specific façade architectural features with focused, low intensity lights.


  • Projects that demand brightly lit facades and entrances, such as casinos, hotels, theatres and commercial complexes, may have a hard time reconciling these desires with the requirements of this credit. Deliberate lighting design can forge a compromise between the desire to emphasize the building facades and the need to eliminate light pollution in order to meet the credit requirements.


  • Identify the urban lighting zone as defined by IESNA RP-33, based on the population density of the neighborhood, in order to establish lighting requirements.


  • Finalize the LEED project boundary in coordination with other LEED credits. The responsible party and the project team should identify the lighting fixtures close to the boundary that will be part of the lighting trespass analysis.


  • Projects with a zero lot line may choose to use the curb as the LEED boundary for the purposes of documenting light trespass only, while using the site boundary for other credits. This is one of the few exceptions to the rule that the LEED boundary and corresponding site area be consistent across multiple credits. Sites that abut public rights of way may similarly use the curb to establish the site boundary for the purposes of LEED documentation. It can be challenging for projects with zero lot lines or with little open space to meet the maximum exterior illuminance requirement of 0.1 footcandles at the site boundary. Project teams are only responsible for lights that are part of their project. For example, municipal lights about which the project has no control do not need to be considered. 


  • Campus projects can choose whether to comply with the requirements for the building site boundary or to meet the light trespass requirements for the campus as a whole. For a project on a campus, choosing to meet the light trespass requirements at the building level can be very difficult.


  • Identify local or regional lighting laws or required lighting levels for rights-of-way that may apply to the project site. These regulations may help teams identify areas to focus on when dealing with lighting trespass in the design.


  • Discuss fixture and lamp options with the landscape designer, civil engineer and other project team members, focusing on both reducing overall lighting power density, and on avoiding light trespass. Avoiding light fixtures that shine up into the sky is the easiest way to reduce light pollution and make better use of lighting. This can be done by eliminating exterior lighting entirely or by selecting “cut-off fixtures” with opaque covers that direct light downward.


  • Core and Shell projects must comply with LEED requirements for all the exterior and façade lighting within the project scope and construction budget. Interior lights fitted by the owner must also comply with LEED’s control requirements. Fixtures not installed within the scope of the LEED project are exempt from credit requirements.


  • Local or regional laws that regulate lighting levels typically do not require minimum input power in watts. Going beyond these local requirements by selecting energy-efficient fixtures can help your project meet codes for comfort and safety goals without compromising energy efficiency.


  • The credit requires a photometric study on site lighting that may add minor consultant costs but will add value by optimizing the design.


  • Optimizing lighting can eliminate unnecessary costs for extra lights and high-power fixtures.


  • Many smaller fixtures may make for a better layout than fewer high-wattage ones. The designer should be able to advise about additional infrastructure costs associated with an atypical lighting design. Low power density and light intensity may require higher first costs for fixtures that will save electricity costs during operations.


  • Rebates and incentives on the federal, state, and local levels are available for low-power and Energy Star lamps.


  • Safety concerns are not typically a valid excuse for higher exterior lighting allowances. Despite a perception of better safety with brighter lighting, floodlights can often create areas of deep shadow, and the high contrast can be difficult for the human eye to navigate. Use good design, downlights, and work with the owner to address any concerns.

Schematic Design

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  • Interior lighting


  • Be aware of all requirements for interior lights so that fixtures do not direct light through windows to the outdoors. Identify locations where fixtures might have a direct line of sight to a window or other opening. The lighting designer should either eliminate those fixtures from the design, provide shades to prevent more than 10% of light from shining outdoors, or include controls to reduce the input power by 50% between 11 p.m. and 5 a.m.


  • Interior lighting cannot spill out of the windows after business hours, defined as 11 p.m. – 5 a.m. in the credit requirements. Window coverings or automatic controls like timers, occupancy sensors, or master switches have to shut off or reduce the input power by 50% for all non-emergency indoor lights during that time.


  • Fixtures that throw 50% or more of the cone of light out a window are likely to present problems.


  • To avoid letting this credit slip through the cracks, project owners or architects should ask the lighting designers at the outset of the project how they plan to achieve each aspect of the credit.


  • Additional light controls and automatic window screens may add to construction costs, but controls can reduce electricity consumption.


  • Exterior lighting


  • Identify the project location and IESNA-designated zone to determine the threshold for exterior lighting levels.  Utilize resources like the website www.citydata.com to identify relevant population density and appropriate designation.


  • The lighting designer includes the design intent in Basis of Design for EAp1: Fundamental Commissioning, for all outside lighting requirements, listing minimum illuminance in footcandles, lumens, or candela for all spaces with controls, fixture requirements and design approach.


  • The lighting designer then develops the exterior lighting layout and selects fixtures that optimize light with low power use.


  • Nadir illustratedTo determine the total power density for the project, the lighting designer tabulates all exterior space and identifies the wattage of selected fixtures to compare it with the LPD allowable by ASHRAE 90.1-2004, Exterior Lighting Section. The selected fixtures should have full shielding or cutoff to reduce light directed toward the night sky.


  • The lighting designer develops a photometric study for exterior lighting intensity, the impact of shades and cutoff fixtures, and light trespass from the project boundary. Use the photometric study to inform any changes in the design.


  • The key to achieving this credit is to find the optimum balance between lighting quality and lighting energy consumption. It is often assumed that more light is better, but a low level of uniform lighting throughout a site will eliminate the need to install bright halogen lamps that illuminate some areas and leave others dark in contrast.


  • Exterior lighting includes all ground lighting, all façade lighting, flag lighting, any rooftop or terrace lighting, and any other fixtures outside the building. Pay careful attention to exterior light fixtures and light levels at building entrances close to the LEED site boundary.


  • Revisit the LPD calculations to make sure any design changes maintain the threshold limits.


  • ASHRAE’s exterior lighting density table lists exterior spaces under two categories. Tradable surfaces are those where the average LPD of all those surfaces are within the total LPD limits. For example, in LZ4, both sales canopy lighting and stairway lighting have a maximum of 1.0 Watts/ft2. The project may decide to increase sales canopy lighting to 1.1 Watts/ft2 as long as the stairways compensate with a decreased LPD of 0.9 Watts/ft2 (given that the surfaces are the same area) so that the average of the two is 1.0 Watts/ft2. For non-tradable surfaces, such as bank ATMs, each space must individually comply with the ASHRAE requirements. Identify whether exterior surfaces are tradable in order to provide flexibility.


  • A photometric study will facilitate communication about lighting levels among the designer, owner and the design team. The study entails computer modeling simulating the lighting intensity of the designed layout in footcandles, lux or candela. It allows the designer to see the resulting output, with iterative design options as the fixtures are reduced or replaced. Typically the photometric study measures light levels in a 10’x10’ grid. The analysis also investigates the maximum initial illuminance value at horizontal and vertical limits on the site boundary to ensure they are within the limits of the project zone. If you find that lights are above the threshold, the designer may want to explore alternative numbers of fixtures and fixture types and present these alternatives to the owner, who makes the final decision.


  • Avoid aiming light at highly reflective site and ground surfaces, such as white pavement and water features, which can exacerbate light pollution. The photometric study may not capture these characteristics.


  • Some lighting manufacturers will offer to perform a photometric study of your site if your team selects their product for the project.


  • Security-oriented lighting designs such as those for prisons, parking lots, and walkways often focus too much on big, bright lamps. This can be counterproductive, creating high contrast between lit and unlit spaces, worsening visibility in both places. Use more moderate, uniform light levels for improved designs.


  • Some types of lighting are exempt from the ASHRAE limits on power density. Examples include advertisement signage, transportation signage, athletic fields, storage, and historic landmarks and other public monuments. Refer to Exceptions under ASHRAE 90.1 2004 Section 9.4.5.


  • The lighting intensity of conventional fixtures such as halogens, incandescents, and sodium halide lighting, drops off significantly after the first year of operation. LED or fluorescent fixtures will better maintain their lighting intensity at the level of the installation—contrary to the common perception that low power wattage fixtures, such as LEDs or fluorescents, have low lighting intensities.


  • Full cutoff fixtures can generally be specified at zero cost premium.


  • Cost premiums for this credit may come from the higher number of (shorter) poles and fixtures needed to achieve greater lighting uniformity.


  • New fixtures like LEDs with high lighting levels but low power density may cost more than conventional halogen fixtures, but most of the new fixtures have longer life and are less expensive to operate due to low electricity use and infrequent lamp replacement.


  • Costs for the photometric study can be decreased if manufactures agree to do their own calculations, which is common if you select their fixtures.

Design Development

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  • Come to an agreement among the owner, landscape designer and lighting designer about the appropriate lighting levels and site lighting distribution.


  • Demonstrate to the owner the project team’s decision about lighting levels for the final design. Owners may need to be shown similarly lit areas to understand the implications of a shift from a brightly lit façade and terrace.


  • Locally mandated lighting levels for exterior fixtures higher than LEED-mandated ASHRAE levels have been a stumbling block for credit compliance, but with proper documentation supported by a clear narrative, this challenge can be overcome. There is an option to not include those fixtures in the LPD calculations and light trespass requirement, but you must demonstrate that these fixtures are full cutoff. To document the credit, make the case that the legally mandated fixtures are beyond the control of the project. Demonstrate that the project has met the requirements with rest of the lighting. Provide a detailed photometric plan, the municipal regulations, and a narrative describing how the project has achieved all requirements of the credit except where the municipal regulations overrule it.

Construction Documents

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  • Confirm all the lighting fixtures are listed on the lighting plan. This ensures that the correct components are purchased and installed to maintain the credit requirements.


  • The designer reviews the final bid documents and budget estimates to confirm that the fixtures have not been substituted for by another type, and that interior lighting controls and window shades are not omitted. 


  • If your team undertakes a value engineering process, make sure the full cutoff fixtures are not eliminated from the list or replaced by incandescent or high-powered halogen fixtures. These changes are often overlooked and may cost the project this credit.


  • If the project is going for multi-party contractor bid, make sure the bid’s package reflects the fixture specifications and performance. Otherwise the contractor may replace the specification with a similar lower-cost fixture that doesn’t have the same wattage or a cover for cutoff.


  • Full-cutoff luminaires should not cost more than conventional fixtures, but other common strategies for meeting this credit may add costs. These include controls, timers, sensors, and  low-power lights like LEDs. Ensure that these features are not eliminated during value-engineering.       

Construction

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  • The designer should review shop drawings and visit the site for installation inspection. This ensures that the fixtures have a cut-off for uplighting, the ballasts are as specified, and the controls are all included.


  • The commissioning agent carries out the functional testing for all control sequences and timers if installed for lighting design.

Operations & Maintenance

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  • Timer controls and automatic switches should be commissioned and inspected for performance periodically throughout their life to ensure they continue to serve the intent of the credit requirements.


  • The facility manager should be involved in the decision of whether to select light timers or automated blinds to comply with interior lighting requirements. Both solutions offer opportunities and challenges during building use, depending on how the building is used and occupied.


  • Long-life, low-power lamps like fluorescents and LEDs will help keep costs low for operations and maintenance.

  • USGBC

    Excerpted from LEED 2009 for Core and Shell Development

    SS Credit 8: Light pollution reduction

    1 Point

    Intent

    To minimize light trespass from the building and site, reduce sky-glow to increase night sky access, improve nighttime visibility through glare reduction and reduce development impact from lighting on nocturnal environments.

    Requirements

    Project teams must comply with one of the two options for interior lighting AND the requirement for exterior lighting.

    For interior lighting

    Option 1

    Reduce the input power (by automatic device) of all nonemergency interior luminaires with a direct line of sight to any openings in the envelope (translucent or transparent) by at least 50% between 11 p.m. and 5 a.m. After-hours override may be provided by a manual or occupant-sensing device provided the override lasts no more than 30 minutes.

    OR

    Option 2

    All openings in the envelope (translucent or transparent) with a direct line of sight to any nonemergency luminaires must have shieldingShielding is a nontechnical term that describes devices or techniques that are used as part of a luminaire or lamp to limit glare, light trespass, or sky glow. (controlled/closed by automatic device for a resultant transmittance of less than 10% between 11 p.m. and 5 a.m.).

    For exterior lighting

    Light areas only as required for safety and comfort. Exterior lighting power densities shall not exceed those specified in ANSI/ASHRAE/IESNA Standard 90.1-2007 with Addenda i for the documented lighting zone. Justification shall be provided for the selected lighting zone. Lighting controls for all exterior lighting shall comply with section 9.4.1.3 of ANSI/ASHRAE/IESNA Standard 90.1- 2007, without amendments1.

    Classify the project under 1 of the following zones, as defined in IESNA RP-33, and follow all the requirements for that zone:

    LZ1: Dark (developed areas within national parks, state parks, forest land and rural areas)

    Design exterior lighting so that all site and building-mounted luminaires produce a maximum initial illuminance value no greater than 0.01 horizontal and vertical footcandlesVertical footcandles occur on a vertical surface. They can be added together arithmetically when more than 1 source provides light to the same surface. (0.1 horizontal and vertical luxMeasurement of lumens per square meter.) at the LEED project boundary and beyond. Document that 0% of the total initial designed fixture lumens (sum total of all fixtures on site) are emitted at an angle of 90 degrees or higher from nadir (straight down).

    LZ2: Low (primarily residential zones, neighborhood business districts, light industrial areas with limited nighttime use and residential mixed-use areas)

    Design exterior lighting so that all site and building-mounted luminaires produce a maximum initial illuminance value no greater than 0.10 horizontal and vertical footcandles (1.0 horizontal and vertical lux) at the LEED project boundary and no greater than 0.01 horizontal footcandlesHorizontal footcandles occur on a horizontal surface. They can be added together arithmetically when more than 1 source provides light to the same surface. (0.1 horizontal lux) 10 feet (3 meters) beyond the LEED project boundary. Document that no more than 2% of the total initial designed fixture lumens (sum total of all fixtures on site) are emitted at an angle of 90 degrees or higher from nadir (straight down).

    LZ3: Medium (all other areas not included in LZ1, LZ2 or LZ4, such as commercial/ industrial, and high-density residential)

    Design exterior lighting so that all site and building-mounted luminaires produce a maximum initial illuminance value no greater than 0.20 horizontal and vertical footcandles (2.0 horizontal and vertical lux) at the LEED project boundary and no greater than 0.01 horizontal footcandles (0.1 horizontal lux) 15 feet (4.5 meters) beyond the site. Document that no more than 5% of the total initial designed fixture lumens (sum total of all fixtures on site) are emitted at an angle of 90 degrees or higher from nadir (straight down).

    LZ4: High2 (high-activity commercial districts in major metropolitan areas)

    Design exterior lighting so that all site and building-mounted luminaires produce a maximum initial illuminance value no greater than 0.60 horizontal and vertical footcandles (6.5 horizontal and vertical lux) at the LEED project boundary and no greater than 0.01 horizontal footcandles (0.1 horizontal lux) 15 feet (4.5 meters) beyond the site. Document that no more than 10% of the total initial designed fixture lumens (sum total of all fixtures on site) are emitted at an angle of 90 degrees or higher from nadir (straight down).

    LZ2, LZ3 and LZ4 - For LEED project boundaries that abut public rights-of-way, light trespass requirements may be met relative to the curb line instead of the LEED project boundary.

    For all zones

    Illuminance generated from a single luminaire placed at the intersection of a private vehicular driveway and public roadway accessing the site is allowed to use the centerline of the public roadway as the LEED project boundary for a length of 2 times the driveway width centered at the centerline of the driveway.

    1The requirement to use ASHRAE Addenda is unique to this credit and does not obligate Project teams to use ASHRAE approved addenda for other credits.
    2 To be LZ4, the area must be so designated by an organizations with local jurisdiction, such as the local zoning authority.

    Potential Technologies & Strategies

    Adopt site lighting criteria to maintain safe light levels while avoiding off-site lighting and night sky pollution. Minimize site lighting where possible and use computer software to model the site lighting. Technologies to reduce light pollution include full cutoff luminaires, low-reflectance surfaces and low-angle spotlights.

Software Tools

SUPERLITE 2.0 ( Lawrence Berkeley National Laboratory)

SUPERLITE 2.0 is a lighting analysis program designed to accurately predict interior illuminance in complex building spaces due to daylight and electric lighting systems.


Litescape 3.0 (Standard Performance Evalutation Corporation)

Lighting simulation software.


Visual 3D

For someone who does not design lighting as their primary service, this free lighting calculation software can be downloaded here.

Other

Elights (Dark-Sky Lighting Products)

Elights sells full cut-off light fixtures.

Technical Guides

Lighting Power Density

A comprehensive source for understanding the lighting models underlying the commercial lighting power limits developed in ASHRAE/IESNA 90.1-2004.


Outdoor Site-Lighting Performance: A Comprehensive and Quantitative Framework for Assessing Light Pollution

This paper describes a method of measuring and predicting glow, glare and trespass in outdoor lighting.


Lighting for Exterior Environments

This publication from the Illuminating Engineering Society defines urban lighting zones according to population density.

Organizations

International Dark-Sky Association IDA

Links to manufacturers with IDA-approved fixtures, information sheets and practical guides, and resources for learning.


Lighting Research Center

This website is associated with the Lighting Research Center at Rensselaer Polytechnic.


Illuminating Engineering Society of North America

This organization provides general exterior lighting design guidance.

Exterior Lighting Power Density

All Options

Perform calculations to demonstrate credit-compliance with exterior lighting power density requirements.

Compliant Light Fixtures

Refer to manufacturer cut sheets for the angle of light spilling above horizontal, the candela graph for maximum candela notation, and watts.

Intersection of Driveway and Roadway

This graphic illustrates SSc8's particular rule for how the site boundary relative to illuminance can expand when a driveway meets a public roadway.

Luminaire Schedule

The schedule lists all the exterior fixtures that will be accounted for in the the lighting power density calculations required for this credit.

Exterior Lighting Layout

Provide documentation like this example to showcase the exterior lighting layout plan. You'll refer to this plan in providing fixture and photometric analysis.

Annotated Photometric Plans

This set of annoatated photometric plans was created by Bill Swanson, P.E. for LEEDuser as a teaching tool for SSc8 documentation issues. They are not intended as examples of actual documentation, though a lot can be learned from them. These documents include a detailed plan showing a compliant site with light levels in the site and as required around the boundary, with advice and useful tips. The fixture comparison document is a means to better understand and compare the spill light from different light fixtures and placements. Think of the purple line as the edge of a cutout with a pin thru the paper where the pole is.  Move the cutout over the site when locating poles, if the cutout overlaps the line beyond the property line then that fixture cannot be located and aimed as placed. The driveway entrance example shows the impact of fixture placement around driveway entrances, and the special allowance for the site boundary around those entrances.

LEED Online Forms: CS-2009 SS

The following links take you to the public, informational versions of the dynamic LEED Online forms for each CS-2009 SS credit. You'll need to fill out the live versions of these forms on LEED Online for each credit you hope to earn.

Version 4 forms (newest):

Version 3 forms:

These links are posted by LEEDuser with USGBC's permission. USGBC has certain usage restrictions on these forms; for more information, visit LEED Online and click "Sample Forms Download."

Design Submittal

PencilDocumentation for this credit can be part of a Design Phase submittal.

141 Comments

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Maria Isabel Conde Owner Aqua Terra (Panama) S.A.
Sep 24 2014
LEEDuser Member
38 Thumbs Up

About interior lights

Project Location: Panama

Hi,

We are working in a CS project and we want to know if the tenant spaces lights must accomplish the requirement of the options or not. The tenants are required to implement this requirements after the CS certification?, The indoor parking also must accomplish the requirements?

Best.

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Bill Swanson PE, LEED AP, Integrated Architecture Sep 26 2014 LEEDuser Expert 15219 Thumbs Up

The tenant lighting is not required to meet these requirements to earn the credit. But if you added language into the Tenant Lease agreement that forced them to comply then you can earn an exemplary performanceIn LEED, certain credits have established thresholds beyond basic credit achievement. Meeting these thresholds can earn additional points through Innovation in Design (ID) or Innovation in Operations (IO) points. As a general rule of thumb, ID credits for exemplary performance are awarded for doubling the credit requirements and/or achieving the next incremental percentage threshold. However, this rule varies on a case by case basis, so check the credit requirements. point in the ID section.

The indoor parking is required to comply with this credit if it is within the scope of the LEED submittal. Most likely it is.

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James Emery Partner Iredale Group Architecture
Sep 15 2014
LEEDuser Member
25 Thumbs Up

Lighting Historic Facades

We have a project where we are restoring an historic building as part of a much larger office tower in an LZ4 zone. The current exterior lighting design includes up lighting of the registered heritage building. ASHRAE 2007 90.1 sec 9.4.5 says that 'i) lighting to be used to highlight features of public monuments and registered historic landmark structures or buildings' are exempt. Does that mean that LEED also considers this as an exemption?

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Bill Swanson PE, LEED AP, Integrated Architecture Sep 16 2014 LEEDuser Expert 15219 Thumbs Up

Nope. You can only exempt the lighting from the energy use calculation per ASHRAE. But the uplight calculation is different, and nothing in the credit excludes it. This is a problem for just about every type of lighting listed in that ASHRAE exemption.

The v4 version of this credit has added several exemptions for lights that match up with some of the ASHRAE exemptions, but not all. Historical buildings are not one of the exemptions allowed.

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Glenn Heinmiller IALD, LC, LEED AP, Principal, Lam Partners Sep 16 2014 Guest 1512 Thumbs Up

James,

If you use the v4 version of the credit (which you are allowed to do on 2009 projects) you can exempt facade lighting from the uplight and trespass limits as long as you are in LZ3 or LZ4 and you shut the lights off at midnight.

Also, i'd be careful about claiming LZ4 - it's really only intended for "times-square" type areas. You are likely to be questioned by the reviewer if you claim LZ4 without any explantion

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James Emery Partner, Iredale Group Architecture Sep 16 2014 LEEDuser Member 25 Thumbs Up

Thank you Bill and Glenn. We will review v4. Thank you also for the comment on zone classification. I gather that what you are saying is that we could be in a high density commercial district in a major metropolitan area (which we are), but if it does not have high nighttime activity then it should really be LZ3. I would classify night time activity in this area as medium compared to other areas in the city.

Post a Reply
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Michael E. Edmonds-Bauer Edmonds International
Aug 21 2014
LEEDuser Member
1675 Thumbs Up

Lights off at 10:00 p.m.

Is it acceptable to set up exterior lighitng to turn off automatically after 10:00 p.m. so when using an illumination model these show up as to be turned-off?

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Bill Swanson PE, LEED AP, Integrated Architecture Aug 21 2014 LEEDuser Expert 15219 Thumbs Up

No. Nothing in the exterior lighting portion of this credit mentions time of use. If you have exterior light fixtures then they need to be considered on for the model. If you have two sets of light fixtures that will never be on at the same time then you need to model the worst case.

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Michael E. Edmonds-Bauer Edmonds International Sep 15 2014 LEEDuser Member 1675 Thumbs Up

Thank you Bill.

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Citlali Mora Bello Arq. Grupo Base
Jul 08 2014
LEEDuser Member

Heliport

Hello, We are working to certify a building with heliport on the rooftop. Do we need to include the lighting project of the heliport for the calculation of this credit?
This heliport will only be working on emergencies, it will NOT provide an on going service, so the lighting will only be on use on these emergency occasions.

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Glenn Heinmiller IALD, LC, LEED AP, Principal, Lam Partners Jul 08 2014 Guest 1512 Thumbs Up

You can use the v4 version of this credit on LEED-2009 projects. The v4 version of the credit exempts lighting that is "specialized signal, directional, and marker lighting for transportation" from the uplight and trespass limits.You might be able to claim that your helipad lighting is this kind of lighting. If this is a hospital then the lighting is definitely exempted as lighting for "hospital emergency departments, including associated helipads".

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Susan Walter Sr Project Architect, Wilmot/Sanz Jul 08 2014 LEEDuser Expert 14599 Thumbs Up

You could also look at Healthcare v3 which also excludes the helipad lighting and is the same rating version.

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Bill Swanson PE, LEED AP, Integrated Architecture Jul 08 2014 LEEDuser Expert 15219 Thumbs Up

I would try to apply LEED InterpretationLEED Interpretations are official answers to technical inquiries about implementing LEED on a project. They help people understand how their projects can meet LEED requirements and provide clarity on existing options. LEED Interpretations are to be used by any project certifying under an applicable rating system. All project teams are required to adhere to all LEED Interpretations posted before their registration date. This also applies to other addenda. Adherence to rulings posted after a project registers is optional, but strongly encouraged. LEED Interpretations are published in a searchable database at usgbc.org. ID#5724 made on 07/06/2004
This excluded helipads for v2.1 projects.

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Mary Ann Santos
Jun 11 2014
LEEDuser Member
2241 Thumbs Up

LPD of garden under a canopy

Our project has a garden on 30th floor where a canopy will be constructed directly above it. To lit the area, lighting fixtures will be placed on the canopy aside from bollard lighting (iGuzzini typha) and strips of led beneath the planter/seating on the garden. For the LPDLighting power density (LPD) is the amount of electric lighting, usually measured in watts per square foot, being used to illuminate a given space. calculation, 1.) will it be possible to separate the LPD of the garden as ‘plaza’ having 0.20W/f2 to ‘canopies and overhangs’ with 1.25W/f2? 2.)will the bollard lighting (iGuzzini typha) be considered in the calculation?

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Glenn Heinmiller IALD, LC, LEED AP, Principal, Lam Partners Jun 11 2014 Guest 1512 Thumbs Up

Mary,

i'm not sure I understand you questions, but here is my opinion:

For the area of the garden that is under the canopy you can take the canopy allowance or the plaza allowance, but not both. So obviously you'd want to take the canopy allowance where you can.

The bollards count . For all the calculations (trespass, uplight, LPDLighting power density (LPD) is the amount of electric lighting, usually measured in watts per square foot, being used to illuminate a given space.) all exterior light fixtures (except gov't mandated street lighting), whether building or ground mounted, have to be counted in all calculations. Technically for the LPD calc only, if a fixture is not powered from the projects electrical system, then it wouldn't be counted.

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Deborah Zimmerman Michaud Cooley Erickson
Jan 28 2014
Guest
32 Thumbs Up

Vertical calculation grid at lighting boundary

To what height does the vertical calculation grid need to go?

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Glenn Heinmiller IALD, LC, LEED AP, Principal, Lam Partners Jan 28 2014 Guest 1512 Thumbs Up

I don't think it's defined. Typically we go to the height of the highest fixture. But note that in the new v4 version of the credit, the vertical grid is required to go to 33 feet above the highest luminaire - so I suppose that would be safe.

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Deborah Zimmerman Michaud Cooley Erickson Jan 29 2014 Guest 32 Thumbs Up

Thanks, Glenn. That's helpful. I was thinking that we should at least go up as high as the tallest poles, but wasn't sure if we should go beyond. 33' does sound a bit extreme, but would be safe for sure.

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Doreen Kruschina Doreen Kruschina Planung+Baumanagement
Oct 29 2013
LEEDuser Member
158 Thumbs Up

Automatic controls in 100% of tenant spaces, EP credit

Dear Bill,

will we get an Exemplary PerformanceIn LEED, certain credits have established thresholds beyond basic credit achievement. Meeting these thresholds can earn additional points through Innovation in Design (ID) or Innovation in Operations (IO) points. As a general rule of thumb, ID credits for exemplary performance are awarded for doubling the credit requirements and/or achieving the next incremental percentage threshold. However, this rule varies on a case by case basis, so check the credit requirements. credit by installing automatic shut-off controls for interior lighting in tenant spaces by means of a tenant lease agreement if we dont achieve SSc8 in general?
Project is a health Center with a variety of medical practises, a pharmacy and a franchise of a food market chain that is not willing to omit its illuminated facade logo.
Thanks for your advice!

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Tristan Roberts LEED AP BD+C, Editorial Director – LEEDuser, BuildingGreen, Inc. Oct 29 2013 LEEDuser Moderator

Doreen, you can only earn an EP point by first earning the underlying credit. Also, SSc8 is not an EP-eligible credit. So it seems like this credit it not a good fit for the project.

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Doreen Kruschina Doreen Kruschina Planung+Baumanagement Oct 30 2013 LEEDuser Member 158 Thumbs Up

Hi Tristan,
in CS Appendix 4 it says:
EP under Tenant Lease or Sales Agreement is available for the following credits:
SSc8: Light Pollution Reduction. Require automatic controls within 100% of the tenant spaceTenant space is the area within the LEED project boundary. For more information on what can and must be in the LEED project boundary see the Minimum Program Requirements (MPRs) and LEED 2009 MPR Supplemental Guidance. Note: tenant space is the same as project space..
There are 3 more EP credits listed in CS Appendix 4:
EAc2, IEQc3 and IEQc4 (4.1, 4.2, 4.3, 4.4)

However, to earn any of the above EP credits the project must achieve the regular credit in the CS scope as well.
Is this correct?
Thanks!

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Bill Swanson PE, LEED AP, Integrated Architecture Oct 30 2013 LEEDuser Expert 15219 Thumbs Up

I agree with Tristan that the base credit must be earned before you can get the EP bonus point.

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David Hubka Director - Operations, Transwestern Sustainability Services May 09 2014 LEEDuser Expert 904 Thumbs Up

Hello all,
To add to the discussion:

SSc8 is listed as an EP eligible credit within CS Appendix 4 of the BD+C reference guide.

The online template we recently submitted on a C&S precert project allowed us to reserve one point in the Innovation in Design credit category for exemplary performanceIn LEED, certain credits have established thresholds beyond basic credit achievement. Meeting these thresholds can earn additional points through Innovation in Design (ID) or Innovation in Operations (IO) points. As a general rule of thumb, ID credits for exemplary performance are awarded for doubling the credit requirements and/or achieving the next incremental percentage threshold. However, this rule varies on a case by case basis, so check the credit requirements. in SSc8. (C&S precertification template Version 4.0)

However this morning we received the review report with this comment:
"there is no exemplary performance path for this credit"

I have a query into USGBC, i will post once i receive a response.

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David Hubka Director - Operations, Transwestern Sustainability Services May 19 2014 LEEDuser Expert 904 Thumbs Up

At this time, exemplary performanceIn LEED, certain credits have established thresholds beyond basic credit achievement. Meeting these thresholds can earn additional points through Innovation in Design (ID) or Innovation in Operations (IO) points. As a general rule of thumb, ID credits for exemplary performance are awarded for doubling the credit requirements and/or achieving the next incremental percentage threshold. However, this rule varies on a case by case basis, so check the credit requirements. is available for SSc8, here is the response from USGBC on 5-19-14:

"IDc1.2 has been marked as Anticipated, and the credit review language has been revised to indicate that Exemplary Performance can be earned for this Core & Shell project. We apologize for this oversight. These changes can now be seen in the Credit Details section of your Review Report."

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Susan Coy
Sep 30 2013
LEEDuser Member
5 Thumbs Up

Exterior Lighting-Sensor Security Lights

Is there any exemptions for Sensor Security Lights, if the only time they come on is when they detect motion after hours?

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Bill Swanson PE, LEED AP, Integrated Architecture Sep 30 2013 LEEDuser Expert 15219 Thumbs Up

Per LEED InterpretationLEED Interpretations are official answers to technical inquiries about implementing LEED on a project. They help people understand how their projects can meet LEED requirements and provide clarity on existing options. LEED Interpretations are to be used by any project certifying under an applicable rating system. All project teams are required to adhere to all LEED Interpretations posted before their registration date. This also applies to other addenda. Adherence to rulings posted after a project registers is optional, but strongly encouraged. LEED Interpretations are published in a searchable database at usgbc.org. ID#5192 made on 05/06/2009

Ruling:
The applicant is requesting confirmation if it is acceptable to exceed the lighting power density requirements with motion responsive after-hours security lighting that is only enabled when the other site lighting is off. Based on the description provided, this strategy is only acceptable provided that when the security lighting is ON, the combined security and general lighting that remains ON, does not exceed the lighting power density thresholds and the security lighting is capable of being controlled to prevent simultaneous operation with the offsetting exterior luminaires. The second question asks if the lights can be excluded from the other requirements of SSc8 and the answer is no. These luminaires must meet the light trespass requirements relative to their declared environmental zone at the applicable site boundary, as well as the sky glowSky glow is caused by stray light from unshielded light sources and light reflecting off surfaces that then enter the atmosphere and illuminate and reflect off dust, debris, and water vapor. Sky glow can substantially limit observation of the night sky, compromise astronomical research, and adversely affect nocturnal environments. requirements of the credit. Applicable Internationally.

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Ivan Souza Sustainability Consultancy Services Cushman & Wakefield
Aug 07 2013
LEEDuser Member
875 Thumbs Up

CS - Interior Lighting 24 hour operation

Hello,

My project is a Core & Shell and will work 24 hours in operation, so how should I proceed to the requirements of the interior lighting?

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Bill Swanson PE, LEED AP, Integrated Architecture Aug 07 2013 LEEDuser Expert 15219 Thumbs Up

Any interior lighting within the scope of work of the Core & Shell project will need to comply with either Option 1 or Option 2 of the interior lighting requirements.

Tenant spaces are not required to comply but should be encouraged. If the tenant spaces are required to comply with this Credit and it is enforced then you can earn an extra point as exemplary performanceIn LEED, certain credits have established thresholds beyond basic credit achievement. Meeting these thresholds can earn additional points through Innovation in Design (ID) or Innovation in Operations (IO) points. As a general rule of thumb, ID credits for exemplary performance are awarded for doubling the credit requirements and/or achieving the next incremental percentage threshold. However, this rule varies on a case by case basis, so check the credit requirements..

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Saud Abdul Rasheed LEED Engineer, Al Yamama Company Mar 09 2014 LEEDuser Member 231 Thumbs Up

Dear Bill,
How is the EP point achieved if tenants are enforced to comply with the credit? How does this work?

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Bill Swanson PE, LEED AP, Integrated Architecture Mar 10 2014 LEEDuser Expert 15219 Thumbs Up

This is the language about what is needed on the Credit submittal form.

EXEMPLARY PERFORMANCEIn LEED, certain credits have established thresholds beyond basic credit achievement. Meeting these thresholds can earn additional points through Innovation in Design (ID) or Innovation in Operations (IO) points. As a general rule of thumb, ID credits for exemplary performance are awarded for doubling the credit requirements and/or achieving the next incremental percentage threshold. However, this rule varies on a case by case basis, so check the credit requirements.
The tenant sales and/or lease agreement contains binding language specifying the requirements for automatic controls for 100% of the tenant spaceTenant space is the area within the LEED project boundary. For more information on what can and must be in the LEED project boundary see the Minimum Program Requirements (MPRs) and LEED 2009 MPR Supplemental Guidance. Note: tenant space is the same as project space..
Upload L-6. Provide the legally binding document (lease, sales agreement, Files: tenant construction requirements, etc.) associated with the project, signed by both the developer and the tenant, explicitly stating the performance requirements for the tenant work.

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Florinda Garcia
Jul 14 2013
Guest
237 Thumbs Up

Facada sign

After Reading the comments, that an internally illuminated advertising signs are exempt, Can I say that if I have an internally illuminated advertising sign on a facade, it doesn't affect the credit compliance? If I comply with the internal and external lighting requirements and there is a a internally illuminated advertising sign on a facade, I compy with the credit requirements? that's right?

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Bill Swanson PE, LEED AP, Integrated Architecture Jul 15 2013 LEEDuser Expert 15219 Thumbs Up

Sounds good to me.

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Ronald Dean Sumac Inc.
Mar 26 2013
LEEDuser Member
1183 Thumbs Up

Scope of SSc8 for Interior lighting

Hello,

I just want to make sure I’m right about complying with this credit. Our building doesn’t have C&S areas that have a direct line of sight to opening in the building envelope. To be more specific, the C&S areas are at the center of the Project and the future tenants areas do have a direct line of sight to opening in the building envelope because they are around the C&S areas.
So, only for interior lighting, I supposed we comply with this credit because it only applies to C&S scope, right? (The reference guide doesn't say anything about this credit in appendix 4)
BTW: We are not persuing EP for this credit.

Thanks in advance.

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Bill Swanson PE, LEED AP, Integrated Architecture Mar 27 2013 LEEDuser Expert 15219 Thumbs Up

You might need to write something in the Tenant guidelines to explain what they should do to comply with this credit. But I don't know of anything thing else that you are required to do for the C&S submittal.

As you found, two years ago they added an EP option for this credit to provide automated controls in all tenant spaces. Since you don't want to pursue this there is nothing requiring you add anything to the tenant spaces.

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Natalie Tan
Mar 17 2013
Guest
186 Thumbs Up

Exterior pool lighting

Is exterior pool lighting exempt from this credit? IES (2011) states that "underwater lighting in swimming pools and other water features" are not regulated by this Ordinance.
Thanks!

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Bill Swanson PE, LEED AP, Integrated Architecture Mar 18 2013 LEEDuser Expert 15219 Thumbs Up

The Model Lighting Ordinance (MLO) written by IESNA for the Dark Sky organization has no impact on LEED. Despite any similarities in both, they are independant. We are governed by the rules and official interpretation in LEED relative to this Credit.

I just assume 50% of a wall mounted pool light is uplight. Keep the math simple.

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Carol Liebst Design Engineer Johnson Engineering
Dec 15 2012
Guest
67 Thumbs Up

School Crosswalk

Working on a site plan for Leed Silver School. I see criteria for using the centerline of the roadway as the project boundary for twice the width of a driveway, but what about a school crosswalk? Is there a similar accomodation for a crosswalk?

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Bill Swanson PE, LEED AP, Integrated Architecture Dec 17 2012 LEEDuser Expert 15219 Thumbs Up

Last week someone pointed out to me a LEED InterpretationLEED Interpretations are official answers to technical inquiries about implementing LEED on a project. They help people understand how their projects can meet LEED requirements and provide clarity on existing options. LEED Interpretations are to be used by any project certifying under an applicable rating system. All project teams are required to adhere to all LEED Interpretations posted before their registration date. This also applies to other addenda. Adherence to rulings posted after a project registers is optional, but strongly encouraged. LEED Interpretations are published in a searchable database at usgbc.org. that allows projects to use the centerline of the road for the whole length of the road. LI #10114 which is applicable to School projects also. Quote this LI in your project submittal. Definition of "Lighting boundary": the lighting boundary is located at the property line or boundary of the LEED project. This boundary may be expanded to include any additional properties owned by the same entity that are (1) contiguous to the project property and (2) have the same or higher Model Lighting Ordinance Lighting Zone designation as the LEED project. Exceptions:  When the property line abuts a public area that is a walkway, bikeway, plaza, or parking lot, the lighting boundary extends to 5 feet beyond the property line;  When the property line abuts a public roadway or public transit corridor, the lighting boundary extends to the centerline of that roadway or corridor.

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Michael Esposito Architect-AIA, LEED AP ADW Architects
Nov 20 2012
Guest
224 Thumbs Up

Existing Ornamental Low-Pole sidewalk lighting (City owned)

I am working on a CS project which is in an urban setting located on a city block where my LEED boundary is established as edge of curb. The city has ornamental sidewalk lights which were already installed prior to our project and will remain about 4 feet off the curb. Do we need to count these existing city-owned lights into our calculation or can we exclude them?

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Bill Swanson PE, LEED AP, Integrated Architecture Nov 20 2012 LEEDuser Expert 15219 Thumbs Up

I found a really old CIRCredit Interpretation Ruling. Used by design team members experiencing difficulties in the application of a LEED prerequisite or credit to a project. Typically, difficulties arise when specific issues are not directly addressed by LEED information/guide that may not be applicable to current projects.
5/23/2005 ID# 5753

LEED is moving in this direction that city owned lights will be exempt from site boundary calculations. I posted something similar to this on the NCv2009 forum in 8-29-11.

"The proposed new version of this Credit will officially exempt city owned and operated lights.

"Until then I recommend people to try and earn this credit and explain why you feel the lights should be excluded from the photometric calculations. Don't be suprised if you're denied.

"You can also try Pilot Credit 7 if you have a spare ID credit available. This would let you exclude some government required lighting."

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Adam Targowski Owner ATsec
Nov 15 2012
Guest
1754 Thumbs Up

Is facade advertising included in illuminance simultions?

1. Is any advertising lighting installed on a facade included in illuminance simulations?
2. It is written here (Bird's eye view) that advertising is not included in LPDLighting power density (LPD) is the amount of electric lighting, usually measured in watts per square foot, being used to illuminate a given space. calculations. Does it mean that both internally lit signs and flood light signs are excluded?

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Bill Swanson PE, LEED AP, Integrated Architecture Nov 15 2012 LEEDuser Expert 15219 Thumbs Up

1) That depends.
2) The Bird's eye view said that signage is not included in the LPDLighting power density (LPD) is the amount of electric lighting, usually measured in watts per square foot, being used to illuminate a given space. calculation, which can include advertising. Only internally lit signs may be excluded.

Is the light integral to the signage? If so then you can exclude it because you can't separate the sign from the light. If it's not, then you have to count it in your calculations because you have control over the light being installed and how it shines on the sign.

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Adam Targowski Owner, ATsec Nov 15 2012 Guest 1754 Thumbs Up

The project is a shopping mall and since it's a core and shell projct there are no facade signs specified in the project yet. However future tenants will most likely install both internally and externally lit facade signs (advertising signage). The question is if the owner should include external lighting requirements in lease documents.

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Bill Swanson PE, LEED AP, Integrated Architecture Nov 15 2012 LEEDuser Expert 15219 Thumbs Up

Yes, that would be part of the Tenant guidelines that the reviewers will want to see as part of the standard lease agreement. That's all you can do for work outside of your project's scope.

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Adam Targowski Owner, ATsec Nov 26 2012 Guest 1754 Thumbs Up

I would like to get back to my first question. Now I know that if the light is integral to the sign then I don't have to include it in LPDLighting power density (LPD) is the amount of electric lighting, usually measured in watts per square foot, being used to illuminate a given space. calculations. But I just wanted to confirm if this rule is the same for illuminance simulation, can I exclude internally lit signs?

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Bill Swanson PE, LEED AP, Integrated Architecture Nov 26 2012 LEEDuser Expert 15219 Thumbs Up

Just ignore any interally lit signs for this Credit. Including in any simulation.

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Adam Targowski Owner, ATsec Nov 26 2012 Guest 1754 Thumbs Up

Thank you for a very quick reply!

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LEED Consultant Green Building and Alternative Energy May 06 2013 LEEDuser Member 1417 Thumbs Up

Hello Bill, I have a question on this thread: Even if tenants' facade lighting is not part of the CS scope, is there the need of the tenants lease agreement? Just as interior lighting for tenants' spaces are not part of the CS scope and thus that requirement is fulfilled without need of further documentation (as stated in the guide) doesn't this also apply to the exterior as well?
Thanks!

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Bill Swanson PE, LEED AP, Integrated Architecture May 07 2013 LEEDuser Expert 15219 Thumbs Up

After the CS project has earned LEED certification, no one is going to be checking up on the site to make sure the tenants are following the rules.

With that said, the intent of the tenants lease agreement is partly to prevent the tenant from messing up credits earned by the CS project. I haven't seen too many tenant fit out projects where facade lighting was added to a CS building. It is usually just signage for the tenant, and that will not effect this credit. If you think a tenant is likely to add some other facade lighting then you may want to add into the tenants lease agreement what limits it must comply with to maintain this credit.

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Alicia Silva CEO Revitaliza consultores
Oct 16 2012
LEEDuser Member
1488 Thumbs Up

Strategy

We are trying a new strategy to achieve this credit: we will turn off all exterior lighting from 11pm to 5am with a timer. Is this a valid strategy instead of uploading a photometric plan?

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Bill Swanson PE, LEED AP, Integrated Architecture Oct 16 2012 LEEDuser Expert 15219 Thumbs Up

Not likely, but you can try for a formal LEED interpretationLEED Interpretations are official answers to technical inquiries about implementing LEED on a project. They help people understand how their projects can meet LEED requirements and provide clarity on existing options. LEED Interpretations are to be used by any project certifying under an applicable rating system. All project teams are required to adhere to all LEED Interpretations posted before their registration date. This also applies to other addenda. Adherence to rulings posted after a project registers is optional, but strongly encouraged. LEED Interpretations are published in a searchable database at usgbc.org.. The 11pm to 5am time is only mentioned for interior lighting.

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Mathilda Jonsson Environmental Certification Engineer (LEED AP BD+C) Skanska
Oct 05 2012
LEEDuser Member
894 Thumbs Up

Exterior signage

Hi,

I recall that I've read that lighted exterior facade signs are excluded from this credit. Am I right? Since we are building a CS building we can't know for now who the tenants will be and if they want lighted facade signs. In the lease agreement it says that the tenant may have facade signs but they have to fix them theirself.

Thanks!

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Bill Swanson PE, LEED AP, Integrated Architecture Oct 05 2012 LEEDuser Expert 15219 Thumbs Up

Internally lit signs are excluded. (Think McDonalds)

Flood light signs are counted. (Think billboard)

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Mathilda Jonsson Environmental Certification Engineer (LEED AP BD+C), Skanska Oct 05 2012 LEEDuser Member 894 Thumbs Up

I mean this kind of lighting , signs that are mounted to the facade. Does this count?

http://www.swedsign.se/produkter/kategori/fasadskyltar/neon-synlig.aspx

/Mathilda

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Bill Swanson PE, LEED AP, Integrated Architecture Oct 05 2012 LEEDuser Expert 15219 Thumbs Up

The link shows signs that can be excluded from this calculations. The light source is inside of the sign's housing.

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Mary Ann Santos
Sep 04 2012
LEEDuser Member
2241 Thumbs Up

Facade Lighting installed inside the building

We have a CS project that proposes a facade lighting that will be installed inside the building (which is at tenant office space areas). This lighting system will be provided and controlled by the building management.

My understanding is that although it is intended for lighting building facade, since it is placed indside tenant office space areas, the power consumption of the design facade lighting will be included in the calculations and requirements for interior offices lighting power density. Is this correct?

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Bill Swanson PE, LEED AP, Integrated Architecture Sep 05 2012 LEEDuser Expert 15219 Thumbs Up

I'm not understanding the situation. How does a light shine on the facade when it's inside of the building?

The inside/outside line is usually drawn at the vapor barrier. If the light is inside of the vapor barrier then it is inside of the building and would be counted towards the interior lighting power density. If it is inside and some how managing to light the building facade then you'll need to control the light with automatic blinds, dimming, or a timer during the hours of 11pm-5am per the interior portion of this credit.

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Mary Ann Santos Sep 05 2012 LEEDuser Member 2241 Thumbs Up

Hi Bill,

My project is a CS project. The tenant spaces will be passed on to the tenants as a bare space. But the project team is proposing to have a building facade lighting; they call it a "light-box effect" type of facade lighting. Instead of the luminaires mounted outside of the facade, it is installed inside the building (at tenant spaces and perimeter of the building).

The installation is intended for facade lighting and it will be under the building management control but as mentioned, it will be installed inside the building, specifically on tenant spaces.

I hope the above made the situation clear.

If the installation is intended for facade lighting but placed on tenant spaces, would the power consumption of the design facade lighting will be included in the calculations and requirements for interior offices lighting power density? or will be considered under the requirements of facade lighting on building exterior?

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Bill Swanson PE, LEED AP, Integrated Architecture Sep 06 2012 LEEDuser Expert 15219 Thumbs Up

I'm not familiar with the phrase "light-box effect". I'm imagining the water cube building from the China Olympics.

I have always counted indoor lighting in the interior LPDLighting power density (LPD) is the amount of electric lighting, usually measured in watts per square foot, being used to illuminate a given space. calculation and exterior lighting in the exterior LPD. If these lights are inside the building then I recommend adding them to the interior LPD value. 9.1.3 says "The installed interior lighting power shall include all power used by luminaires ..."

I cannot find any examples or information about interior lighting intended for exterior use as an exception to how the watts get counted.

And I don't know why putting them into the tenant spaceTenant space is the area within the LEED project boundary. For more information on what can and must be in the LEED project boundary see the Minimum Program Requirements (MPRs) and LEED 2009 MPR Supplemental Guidance. Note: tenant space is the same as project space. would make a difference. You're installing it under the CS scope of work and Tenant's are suppose to sign a contract that their use of the building won't void LEED credits earned.

Regarding this Credit, this lighting will need shut off or 50% dimming during the hours of 11pm-5am.

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Bill Swanson PE, LEED AP, Integrated Architecture Sep 06 2012 LEEDuser Expert 15219 Thumbs Up

If this is what you mean by "light-box effect" then it's a definate no. This is what this credit is trying to stop.
http://blog.buildllc.com/wp-content/uploads/2011/08/BUILD-LLC-Park-Moder...

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Mary Ann Santos Sep 06 2012 LEEDuser Member 2241 Thumbs Up

Thanks for the inputs, Bill.

I think the link you provided is something similar on my situation. What do you mean by "definate no"?

Thanks again.

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Bill Swanson PE, LEED AP, Integrated Architecture Sep 07 2012 LEEDuser Expert 15219 Thumbs Up

The "definate no" comment meant that this link is showing interior lighting. This cannot be considered facade lighting.

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Hrvoje Kvasnicka
Jul 19 2012
Guest
50 Thumbs Up

Exterior Lighting?

I'm working on an office project that has a retail element on the ground floor. The retail area features a corridor connecting individual retail units which is open at its ends, ie. no doors will be installed there. My question is: do the corridor luminaires in this case qualify as exterior lighting? Because if they don't, we would have no exterior lighting which would make our job easier. I have looked for a definition of exterior lighting but couldn't really find it anywhere. Thanks!

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Bill Swanson PE, LEED AP, Integrated Architecture Jul 20 2012 LEEDuser Expert 15219 Thumbs Up

LEED InterpretationLEED Interpretations are official answers to technical inquiries about implementing LEED on a project. They help people understand how their projects can meet LEED requirements and provide clarity on existing options. LEED Interpretations are to be used by any project certifying under an applicable rating system. All project teams are required to adhere to all LEED Interpretations posted before their registration date. This also applies to other addenda. Adherence to rulings posted after a project registers is optional, but strongly encouraged. LEED Interpretations are published in a searchable database at usgbc.org. - 12/18/2007 ID# 1956
They ruled that open air covered parking garage shall be considered interior for spaces that are covered and exterior for spaces that are not.

I would consider this corridor to be interior lighting. If a canopy extents past the normal boundary of the building then I'd consider that to be exterior lighting at that point.

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Hrvoje Kvasnicka Jul 20 2012 Guest 50 Thumbs Up

Thanks for your reply. Just to clarify, you're saying that if a luminaire is installed on this canopy extending past the normal boundary, this luminaire would be considered exterior lighting OR interior corridor lighting would be considered exterior if there is a canopy extending beyond the building boundary?

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Bill Swanson PE, LEED AP, Integrated Architecture Jul 20 2012 LEEDuser Expert 15219 Thumbs Up

What's the building foundation boundary? If the lights are in a canopy outside of the foundation I consider it exterior lighting. The corridor lighting within the foundation outline I consider to be interior lighting.

I'm sure it's possible to pick apart the wording I used and find situations with sloped walls. Just use common sense. When walking from outside in to the corridor, at what point does it feel like you are now inside?

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Hrvoje Kvasnicka Jul 20 2012 Guest 50 Thumbs Up

The building has an underground garage whose footprint (and hence the building foundation) extends well beyond the footprint of the above ground structure so I'm guessing I could not use that criterion. But anyhow, considering what you said I'm guessing if we locate the lights 3-4 metres from the building boundary and treat them as internal, we should be fine. Thanks!

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Alicja Bieszyńska Skanska
May 30 2012
LEEDuser Member
1035 Thumbs Up

entrance lighting

Can I consider entrance lighting (light fixtures above the building entrance) a safety and comfort lighting? And therefore not to include it in the calculations?

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Bill Swanson PE, LEED AP, Integrated Architecture May 30 2012 LEEDuser Expert 15219 Thumbs Up

Why would you think safety and comfort lighting could be excluded?

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Alicja Bieszyńska Skanska May 30 2012 LEEDuser Member 1035 Thumbs Up

Right, there's nothing in the manual that would allow me to exclude the safety and comfort lighting :)

However, my building is a zero-lot-line project and the external walls of the building are just on the site boundary. Therefore, if I have any entrance lighting, it has to shine beyond the boundary, and exceed the permitted 0,6 footcandle on the site boundary and 0,01 15ft beyond it.

Do you think I cannot apply for this credit?

Or maybe the fact that the project is located in the LZ4 zone and that there is a public sidewalk adjacent to our site boundary would help? Then we could treat the curb line as our site boundary, right?

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