The requirements of this credit—providing lighting controls for at least 50% of occupants—are not technically difficult to achieve. Virtually all existing buildings have at least two light settings in group spaces, and task lighting is common, easy, and affordable
You will need to conduct a thorough inventory of lighting controls to verify compliance. This documentation effort is doable, but can become tedious and time-consuming for large buildings with many different types of spaces or multiple tenants.
Adding lighting controls is a great strategy for reducing energy consumption and improving occupant comfort and productivity. They allow occupants to adjust lighting levels to their specific needs, rather than relying on a broadly over-lit space.
Plug-in task lighting is provided at individual workstations at Trinity Real Estate headquarters in New York, which earned this credit. Photo – YRG SustainabilityHowever, simply meeting this credit’s requirements does not ensure that you’ll meet either of those objectives. To truly achieve these outcomes, plan to go beyond the minimum requirements of this credit and provide lighting controls that provide flexibility and comfort to specific conditions, that address appropriate visual tasks, and that smoothly integrate the electric lighting system with available daylight.
Although this requirement not explicitly stated in the LEED Reference Guide, project teams are now being asked to demonstrate that at least two levels of control are provided in multi-occupant spaces (like conference rooms). A single on-off switch is not compliant, and an on-off switch with an occupancy sensor is no longer compliant either. Examples of the most common compliant scenarios for multi-occupants spaces include: two (or more) lighting zones with on-off switches; an on-off switch combined with window blinds; and an on-off switch with a dimmer.
This scenario, which is common to museums, visitor centers, cafeterias, and fitness club, falls under the “special-use space” category. In special-use spaces where visitors are given limited access to lighting controls, you can meet the credit requirements by specifying that building staff will be available to adjust lighting conditions as necessary. Provide a clear narrative describing the details of the space and how building staff are available and instructed to adjust lighting.
Projects that have earned the credit related to lighting control under LEED for New Construction or LEED for Schools can follow the D+C Streamlined Path for documenting this credit. You must submit a copy of the official LEED scorecard and confirm that the design and construction elements that contributed to the previously earned credit are either still in place or explain that minor changes do not put into question the potential achievement of this credit. If no major changes have occurred, no further action is necessary to achieve this credit. If there have been significant alterations to the building’s lighting controls, the project must follow the documentation requirements of the O&M submittal path.
Perform an inventory assessing the number, type, and location of current lighting controls. See the Documentation Toolkit for a spreadsheet you can use, along with an example inventory.
The inventory can be performed in tandem with similar space-by-space audits required by other LEED credits, such as an energy walk-through audit (EAp1), an IAQ audit (IEQc1.1) a green cleaning audit (IEQc3), and a daylight and views study of the building (IEQc2.4).
Doing an early inventory has some advantages, although you may do it anytime, before or during the project’s performance period. If you document existing lighting controls and then assess opportunities for improvement before or early in project’s 12-month performance period for recording energy data, you can help the project's energy performance as measured for EAp2 and EAc1.
Include in your credit calculations any spaces in which a person is likely to cumulatively spend a large part of the workday. These are considered “regularly occupied.”
Exclude from your credit calculations any spaces used for storage, circulation, or bathrooms, as these are not considered “regularly occupied.”
To meet credit requirements, task lighting does not need to be hardwired. Plug-in lamps or task lighting built into cubicles or office furniture is the most likely method of compliance.
Private offices with at least one on-off switch comply.
Workstations in large open rooms are considered individual, not group, multi-occupant workspaces.
In multi-occupant workspaces the credit requires that controls are "adjustable to suit group activities and allow flexibility for different uses." It used to be that occupancy sensors with manual overrides plus an on-off switch would count, but that's not the case anymore. Project teams are now being held to demonstrating at least two levels of control in these spaces. Compliant scenarios could include having two or more lighting zones separately controlled by on-off switches, an on-off switch combined with blinds on windows, or an on-off switch with a dimmer.
Although occupancy sensors do not offer occupants as much direct control, LEED allows occupancy sensors as a substitute to other lighting controls due to the energy efficiency benefits.
In special-use spaces—such as museums, visitor centers, or fitness clubs—where visitors have limited access to lighting controls, meet the credit requirement by specifying that building staff will be available to adjust lighting conditions as necessary.
To meet the lighting control requirements for this credit, these individual workstations would require task lighting in addition to the overhead light fixtures shown. Photo – YRG SustainabilityDetermine the upgrades and complete the modifications necessary to meet credit requirements. To achieve this credit lighting controls must be provided for at least 50% of individual workstations and 50% of multi-occupant space in the building.
Since the credit sets a very achievable threshold, also consider additional opportunities to enhance building performance and occupant comfort. For example, add lighting zones based on specific types of visual tasks and the availability of natural daylight and consider dimming or “stepped” lighting systems tied to daylighting sensors.
Take a holistic approach to lighting upgrades. In addition to improving controllability, consider improvements and trade-offs related to comfortable light levels and color temperatures, efficiency and performance, mercury content, and other factors. There may be easy, low-cost opportunities to do things like install more efficient lamps and upgrade fixtures.
For projects pursuing MRc4: Sustainable Purchasing—Reduced Mercury in Lamps, ensure that any lamps purchased for lighting upgrades or additions do not exceed the maximum level of mercury permitted.
Any energy savings associated with lighting controls that have been in place during the project’s 12-month record of energy data will contribute to the building’s performance rating for EAp2: Minimum Energy Efficiency Performance and EAc1: Optimized Energy Performance.
Keep the inventory of controls current, and update whenever lighting systems are altered or if major shifts in tenants or occupancy occur.
Consider monitoring the use and benefit of lighting controls through occupant surveys, per IEQc2.1: Occupant Comfort—Occupant Survey.
Excerpted from LEED 2009 for Existing Buildings: Operations & Maintenance
To provide a high level of lighting system control by individual occupants or groups in multioccupant spaces (e.g., classrooms and conference areas) and promote their productivity, comfort and well-being.
For at least 50% of building occupants, use lighting controls that enable adjustments to suit the task needs and preferences of individuals for at least 50% of individual workstations, and for groups sharing a multioccupant space or working area for at least 50% of multi-occupant space in the building.
Implement system and occupant control of ambient and task lighting to suit individual preferences and the needs of specific tasks.
This updated version of the spreadsheet categories dozens of specific space types according to how they should be applied under various IEQ credits. This document is essential if you have questions about how various unique space types should be treated. Up to date, 2nd Edition.
This spreadsheet categories dozens of specific space types according to how they should be applied under various IEQ credits. This document is essential if you have questions about how various unique space types should be treated. This is the 1st edition.
The CLTC works to advance energy-efficient lighting and daylighting technologies through technology development, demonstrations, and outreach. The CLTC website is an excellent resource for original research and case studies detailing effective lighting retrofit solutions.
This research center provides evaluation of lighting solutions, studies of the effects of light on human health, manufacturer-specific information and performance data, and guidelines for how to use task lighting effectively.
This article provides useful discussion of sophisticated lighting controls.
This handbook provides IESNA guidelines for selecting appropriate luminance levels for visual tasks.
Complete LEED Online documentation for achievement of IEQc2.2 on a certified Gold LEED-EBOMEBOM is an acronym for Existing Buildings: Operations & Maintenance, one of the LEED 2009 rating systems. 2009 project in Denver, Colorado.
Assess your project building's compliance with this credit with an inventory of the number, type, and location of current lighting controls. You can work with the spreadsheet here, along with an example. (The sample floorplan illustrates the example given in the spreadsheet.)
A floorplan like this is not required for credit documentation, but if available, it is helpful for mapping out credit compliance.
Sample LEED Online forms for all rating systems and versions are available on the USGBC website.
Are rechargeable battery-powered task lighting units acceptable for this credit? The manual makes only this comment on page 398: "Task lighting does not need to be hardwired to meet the requirements of this credit: outlet-powered task lighting provides a simple and effective way to add additional control in existing buildings".
I don't see why battery powered task lights won't count towards the fulfillment of this credit. It seems like this lighting meets the intent of the credit which is to provide additional lighting controls for the occupants. So as long 50% or more of the individual workstations have these task lights, it should meet the requirements of this credit.
My project is a winery with a 300 square foot lab. There are three workstations, but only two employees work there most of the time. None have task lighting per se, but the overhead lighting has four different settings: on/off, center pendants, perimeter lighting and counter. The perimeter control provides task-like lighting because it lights directly above two of the workstations and can be isolated from the overhead lighting control. When inputting the number of workspaces w/ lighting controls, what number would you recommend putting in?
I could see either inputting 2 if the perimeter lighting counts as task lighting, or 3 since every station has access to 4 lighting controls.
If the perimeter lighting is really only useful for the two workstations nearby, and if the lighting can be isolated for each workstation (like pendant lights over the desks would), then it might qualify as an individual lighting control. If it contributes more to the overall room lighting and isn't isolatable to specific desks, it might fall under general area illumination controls for multi-workstation spaces, which do not qualify in this credit.
We are working with a client in a 1.2 mill. SF office building with three towers connected by a central core. The towers are essentially identical; all conference room or multi-occupant spacesMulti-occupant spaces are places of egress, congregation, or where occupants pursue overlapping or collaborative tasks. Multi occupant spaces may be regularly or non-regularly occupied spaces. have multiple levels of lighting (dimming, shading etc.) In addition, most if not all, individual workstations have task lights, and it is company policy to provide task lighting if requested.
Given the effort associated with calculating compliance at the workstation and room level in each tower across such a large SF, does anyone have any thoughts regarding the acceptability of providing data for a representative sample of rooms or single tower? We believe the project complies with the intent of this credit, but feel the effort to document may present a challenge.
In our experience, the review teams want to see distinct spaces listed separately on the form to verify that individual spaces have been assessed again the credit requirements. But if there is a single tenant in all three buildings, you can show that the controls are typical in all applicable spaces, and that all of the required regularly occupied have been addressed, you might be able to make the case via a narrative and skip some of the documentation busy work. It seems like it would be worth a try.
Hi, I am working on a LEED project in an office building that has environmental labs. Some of the labs have workstations to input data, but not a permanent desk for an occupant. First question..
Do I consider these workstations as "individual occupant work spaces"?
A couple labs do have permanent desks for occupants, but no additional light controls because the lab environment requires certain lighting.
Would I consider these exempt?
I looked on the Space Matrix and for Office Buildings there is no mention of labs.
Would I therefore consider all spaces exempt?
I'd love some feedback!
You may come across a review response that says "regularly occupied spacesRegularly occupied spaces are areas where one or more individuals normally spend time (more than one hour per person per day on average) seated or standing as they work, study, or perform other focused activities inside a building. are those You may come across a review response that says "regularly occupied spaces are those where people stand or sit as they work" so workstations aren't limited to permanent desks. A work station doesn’t have to be occupied for the majority of a shift to be counted, it has more to do with the type of activity done there and how important it is for an occupant’s work.
In the IEQ space matrix you’ll finds Labs listed in Educational Facilities and Health Care Facilities where they are expected to comply with IEQc6. The matrix is titled for BD&C and ID&C, but I think many people have assumed it would apply to EBOMEBOM is an acronym for Existing Buildings: Operations & Maintenance, one of the LEED 2009 rating systems. IEQc2.2 as well.
So although the spaces are probably not exempt, would it be possible to provide local task lights at these work areas? That’s probably what the reviewers would look for.
As it wasn't mentioned anywhere. I would like to enquire, for Hotel project, if there are individual switches for each light or set of lights. Such as 1 light switch for the entire bedroom, would such a set-up qualify for this credit.
For this credit the guest rooms would probably be okay since they usually have multiple light switches. But we also need to provide light controls for 50% of the hotel employees, which can be harder. Employees that work at desks would need task lights. Conference rooms and event rooms would need lights on dimmers that the occupants can control.
We have a production line with about 2000 workers that has both a skylight system and an artificial lighting system that only works when the daylight level goes below a specified limit. This design allows lot of energy efficiency and at the same time maintain the light level in the production line above a minimum required level.
We have a guideline of the minimum light levels to be maintained and annually an independent party comes to assess whether that levels are maintained. Will this scenario be eligible for this credit given that in such a big production line the most important aspect is the required level of lighting for the process efficiency and safety of the workers?
Magda, the system you describe sounds like it makes sense for the application, but I don't see it has a good fit for this credit. The key idea is controllability, and the workers in this case don't have control over the light levels. If they had some feedback mechanism, that would help.
It’s not an easy credit to earn in a production facility, but we've seen this credit earned in by doing two things.
Some of the most promising case studies on the role of daylight or good lighting controls have come from production facilities where it been possible to measure error rates or output before and after lighting upgrades, so don’t underestimate the potential for real financial benefits!
1. Assemble a table with all the spaces and steps in the production line. For each space, describe the activity, level of visual acuity required (Hi, Med, Low); lighting provided (Ambient only (footcandles); Task+ Ambient (fc1. A footcandle (fc) is a measure of light falling on a given surface. One footcandle is defined as the quantity of light falling on a 1-square-foot area from a 1 candela light source at a distance of 1 foot (which equals 1 lumen per square foot). Footcandles can be measured both horizontally and vertically by a footcandle meter or light meter.
2. The non-metric measurement of lumens per square foot, one footcandle is the amount of light that is received one foot from a light source called a candela, which is based on the light output of a standardized candle. A common range for interior lighting is 10 to 100 footcandles, while exterior daytime levels can range from 100 to over 10,000 footcandles. Footcandles decrease with distance from the light source. The metric equivalent of a foot candle is 10.76 lux, or lumens per square meter.); Type of lighting controls.
2. Provide and describe task lights or localized lighting controls at areas where higher visual acuity is needed.
For example, see the fork lift operator question below - headlights to see materials, and a task light for doing paperwork. Or a station on a production line for inspecting items could have spot lights on separate controls to supplement the ambient lightingLighting in a space that provides for general wayfinding and visual comfort, in contrast to task lighting, which illuminates a defined area to facilitate specific visual work..
Hope that helps!,
I am working on certifying a warehouse, and would like to consider the forklifts as individual workstations, as the warehouse employees are each assigned one (in lieu of a desk) and allowed to personalize it, as well as spending the greater part of their day on them. The warehouse is outfitted in high bayA bay is a component of a standard, rectilinear building design. It is the open area defined by a building element such as columns or a window. Typically, there are multiple identical bays in succession. lights on occupancy sensors, and each of the forklifts is equipped with headlights and map/task lights. Do you see any reason why this approach wouldn't work?
Melissa, that's a novel approach and I would like to think it would work. It really seems to me to make sense—can't think of any issues. I would be sure to explain in your narrative why you are taking this approach and how it is justified.
For multi-occupant spacesMulti-occupant spaces are places of egress, congregation, or where occupants pursue overlapping or collaborative tasks. Multi occupant spaces may be regularly or non-regularly occupied spaces., a compliant option mentioned in the Bird's Eye View is to have an "on/off switch combined with blinds for a window." Is the same true for individual workspaces?
If overall lighting levels are determined by overhead area-wide lighting, but the individual workstations each have a daylight window with blinds, can these workstations count toward achieving this credit?
I've never seen that approach attempted but I don't think that it would be accepted. The reference guide speaks to task lighting for individual workstations and so I think a reviewer would key in on that. Also, the blinds option for multi-occupant spacesMulti-occupant spaces are places of egress, congregation, or where occupants pursue overlapping or collaborative tasks. Multi occupant spaces may be regularly or non-regularly occupied spaces. requires control over an on/off switch too, which it sounds like the individual workstations in your case wouldn't have.
Thank you, Ben. I understand your point, but just to take the discussion further - we want daylighting to replace electrical lighting, so what is wrong with considering an individual daylighting device (i.e. window, Solatube, etc.) as a form of "task lighting"? If you agree with this, then wouldn't a control for this daylighting device (i.e. blinds, Solatube "daylight dimmer control", etc.) count towards this credit?
My understanding is that only one individual lighting control for an individual workstation is required for a workspace to count toward achieving this credit (vs. the two lighting controls required for multi-occupant spacesMulti-occupant spaces are places of egress, congregation, or where occupants pursue overlapping or collaborative tasks. Multi occupant spaces may be regularly or non-regularly occupied spaces.). Is this correct?
If all of the above statements are correct (indiv. daylight device = "task lighting"; indiv. daylight control = "indiv. lighting control"; only one indiv. lighting control is needed for compliance), then would a set of blinds for a window at each individual workstation count towards meeting the requirements of this credit?
Thank you for insight.
It seems possible but my guess is that you would need to submit a project specific 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 to have a chance at earning the credit with that type of strategy. Another consideration for the strategy that you've lined out is what type/level of control do individuals have when there's insufficient daylight available for normal tasks (early morning, evening, seasonally short daylight days, overcast days, etc.)? That makes it seem like a challenging approach with respect to earning this credit as well.
Thanks for talking it through with me, Ben.
Quick clarification on this: Does a private office with an overhead light switch and adjustable blinds comply with the requirements? I could see why cubicle work spaces need task lighting, but for private offices, does the switch and blind offer enough control?
The private office you've described does indeed comply Emily. I think you've got the logic down exactly.
Hope that helps,
Hi All, For a convention center building where over 90% of the building consists of "multi-occupant spacesMulti-occupant spaces are places of egress, congregation, or where occupants pursue overlapping or collaborative tasks. Multi occupant spaces may be regularly or non-regularly occupied spaces." i.e. conference rooms, meeting rooms, exhibit halls, do they need to be included in this case? The controls are present in all of these spaces listed but unsure if they need to be cataloged for this. These are by no means "regularly occupied" such as the other multi occupant spaces used by staff for internal meetings and functions. Thank you!
You are right that the building staff would need adequate lighting controls in their offices and internal meeting rooms. Exhibition spaces are not specifically addressed in the credit language, but I think they would need to be included.
When you look at the IEQ space type matrix, it says that auditoriums, conference rooms, and exhibition halls should be included in the spaces that need to comply with this credit. They might be considered "regularly occupied" because they are frequently and primarily intended to be used as an auditorium, or meeting, conference, exhibit space.
The question then is what kinds of controls are needed? That’s not entirely clear. It would be important for the organizer of an event to be able to adjust the lighting for each space to suit the activity and users. (You’ve probably attended a session on green building or IAQIndoor air quality: The quality and attributes of indoor air affecting the health and comfort building occupants. IAQ encompasses available fresh air, contaminant levels, acoustics and noise levels, lighting quality, and other factors. in an event space with no windows or user controls...) The event organizer would want the ability to adjust the lighting levels in a space before the program begins, and ideally during the session as well.
You might be able to document this with an electrical narrative that describes how lighting can be controlled in individual spaces once they have been set up for events. (Some DALI controls assign IP addresses to individual fixtures on a networked lighting system and thus don’t have to have all lighting scenarios hardwired in place.)
This sounds like a question you could submit to GBCI technical support that tristan describes over at:
the more specifics you can include about your lighting controls, the better!
Unfortunately, I believe bathrooms and corridors have to be included in the IEQc2.2 calculations. The EB:OM IEQ space type classification document (http://www.usgbc.org/ShowFile.aspx?DocumentID=10539) clearly has a Y in the column for "Lobbies, corridors, restrooms" in Office spaces meaning that "The space must be included in the credit requirements."
Unless I'm reading something wrong it seems that almost all spaces, regularly occupied or not still must be included in the IEQc2.2 credit requirements.
Perhaps simply a motion sensor in those spaces would be enough to comply with the credit requirements, but they must be counted nonetheless. If I'm wrong, please clarify. Thanks!
Notwithstanding the document Emily cited, (which, I agree, seems to suggest that restrooms & corridors should be included) I can't see how including restrooms and corridors would make any sense. There's no 'indoor environmental quality' value in providing multiple lighting controls in a corridor or bathroom, nor do occupants need, want or benefit from modulating light levels in those areas. Energy benefits, perhaps, but that's not what this credit is about.
For what its worth, in many years of submitting and reviewing EB applications I don't think I can remember ever expecting restrooms or corridors to be included under this credit. The BAS credit, absolutely, but not here.
Our building had two types of power source, one is normal power, one is essential power (back up by genset) and also supply two kind of power for lighting system. Each multi occupant space (library, pantry, clinic, restroom, mother room, gym, corridor, lobby, conference rooms) has two on/off switches, one control for normal light and the other for essential light (same fixture but different power source). I want to know is it considered to comply with credit's requirement.
Can the people in the multi-occupant spacesMulti-occupant spaces are places of egress, congregation, or where occupants pursue overlapping or collaborative tasks. Multi occupant spaces may be regularly or non-regularly occupied spaces. change the lighting levels at any time they want? Or are the switches there only for times when the back-up genset is running?
If having two switches lets them adjust the lighting levels for more or less light any time the building is being used, then it sounds like it meets the credit requirement. But if the switches only help when normal power is disrupted, then it doesn't sound like they meet the requirements.
We're pursuing EB:O&M on several campus buildings including residence halls, classroom buildings, and office buildings. Office and classroom buildings are obvious to me when talking about "work space" and multi-occupant space" but what about dorm rooms? I believe they all come standard with one desk for each resident. There is a light switch that controls overhead lighting in the room and in some cases a built in light on the desk. Do you think the room light switch would count? Do we seriously have to go into ever dorm room and check if they have a desk lamp? Or would dorm rooms not necessarily include a "workspace" as LEED intends it. Thanks.
Take a look at the Space Classifications zipped spreadsheet from the IES Lighting Handbook, 10th Edition and listed under Resources at:
On the BO+M tab, for Dormitories/ Residences, Bedrooms, Reading & Study Areas are defined as Individual Occupant spacesIn individual occupant spaces, occupants perform distinct tasks from one another. Such spaces may be contained within multi-occupant spaces and should be treated separately where possible. Individual occupant spaces may be regularly or non-regularly occupied spaces.. in the table above, . In the NC EQc6.1 forum, there's a discussion about task lights and two-bedroom dorm rooms that's relevant.
In the Birds Eye View at
bedrooms in an apt just need one switch, but "workstations" need a task light. It's not clear which standard to apply here.
A dorm room might be seen differently than a multi-family residential bedroom, especially if the dorm room houses more than one person. There are several possible interpretations: in a 1 person dorm room, a single light switch and operable blinds/ window shades might be seen as sufficient, or perhaps the reviewer would insist on one task light per person in addition to the general light switch.
Since this space matrix was referenced more recently than some projects were registered, there's a heated discussion over at NC 2009 EQc6.2 on it's applicability, and a USGBC staffer did chime in to say they are working on an updated space matrix for IEQ credits, possibly for the Oct 1, 2012 addendum.
In the meantime, you might consider doing a random survey of a reasonable number of dorm rooms to see how many have task lights, and clarify the number of occupants per dorm room. Given the ambiguity of the requirements and even the newer referenced space matrix, seems like a representative survey rather than inspecting every single room would be reasonable.
We are currently working in a facility that that has a system called "Softswitch" from the Lutron Electronics Co.
The systems provides automated control of lighting to optimize energy efficiency in small offices and open spaces. Turn lights on and off based on time of day, occupancy or feedback from a building management system for simple, convenient control. System flexibility lends control over numerous lighting zones to optimize energy savings. Individual zones can be programmed to highlight exterior architectural features.
The problem that I'm having is that using the LEED Template my percent for individual workstations are not complying with the minimum. But I do have this system, can this system help meet the minimum percent for indivual workstations in some way?..
Thank in advance.
For individual workstations, the easiest way to meet this credit is with individual task lamps. Your Lutron system is great, but I don't think it will give 50% of your workstation occupants control over their individual lighting...
I'm confused about the credit requirements.
Reviewer comment: Per the Calculations section of IEQc2.2 in the LEED Reference Guide, provide a narrative to describe the lighting controls in the conference room and ensure that the space allows for more than two levels of lighting.
LEED Reference Guide: No specific types or numbers of controls are required.
I can not find anywhere in the LEED addendum, reference guide, etc that lists requirements for more than two levels of lighting. But I found that exact statement in an online pdf from the GBCI: ￼￼LEED Project Submittal Tips: EBOMEBOM is an acronym for Existing Buildings: Operations & Maintenance, one of the LEED 2009 rating systems. 2009.
Which standard should I be using, the LEED Reference Guide or the pdf from GBCI. Or is there a source of LEED changes that I'm missing.
It's best to use the sample template forms available for viewing at LEED Online; these provide the most current, complete, and correct information that must be provided by the project team. The LEED reference guide is not as current as the LEED Online templates.
We are currently working in a higher education campus where there are several space types such as pools, cafeterias, stores, laboratories, studios, residences, workshops, lounges and a radio studio.
Do we include all of them in our evaluation as special-use space type?
Or is it best to just concentrate on typical workspaces that there are in this type of building (classrooms, offices, ...)?
You'll need to consider all workstations, not just the typical office ones. You can see a related discussion over at the NC 2009 EQc6.1 forum topic - there is a comment I posted on March 29, 2011 that describes an approach that would probably apply to your situation.
Word on the street is that there's a new standard teams are being held to for the types of controls that are allowed in group spaces. Historically, pretty much any kind of control was allowed, including on/off switches, and the current Reference Guide seems to promote that by saying “no specific types or numbers of lighting controls are required.”
In very recent times, only more advanced controls like dimmers have been allowed. Unfortunately, there's not very much clear information about what's going to be allowed in the new lighting control world order, but I've heard that tiered lighting, dimmers, and (curiously) on/off switches + blinds to daylight window are okay.
Just a heads up, and maybe people can chime in the types of controls that seem to be getting accepted as of late.
Very timely heads up, Jenny. We recently saw similar comments for this credit:
"Lighting controls must enable adjustments to suit task needs....Please provide documentation demonstrating that the group multi-occupant spacesMulti-occupant spaces are places of egress, congregation, or where occupants pursue overlapping or collaborative tasks. Multi occupant spaces may be regularly or non-regularly occupied spaces. have controls that are adjustable to suit group activities and allow flexibility in different uses. On/off controls and occupancy sensors alone are not sufficient to meet credit requirements."
Again, they're not specifying the types of controls, but this does suggest dimmers, stepped dimming, separately switched banks or zones, or bi-level switching. The BD&C Reference Guide for IEQc6.1 has a list of these controls in Figure 2 on page 524, which would seem to apply here as well.
I've always found the occupancy sensor allowance in this credit to be odd (and inconsistent with occupant control, even if its consistent with energy savings) but I'm surprised by this kind of mid-course correction. Isn't it incumbent on USGBC/GBCI to make a formal announcement of this kind of policy change, and to exempt buildings registered before the announcement? I dare say that many projects may have elected not to change control regimes because they were considered compliant even a few weeks ago.
I agree with Dan on the compliance issue. Anyway, this is what I have to add in this thread from my review received 9/20/2011: "Various switches for different lighting levels, dimmer switches, or a simple on/off switch accompanied by blinds on the windows are examples of acceptable lighting controls for multi-occupant spacesMulti-occupant spaces are places of egress, congregation, or where occupants pursue overlapping or collaborative tasks. Multi occupant spaces may be regularly or non-regularly occupied spaces."
We have some rooms in our buildings that were originally intended to be office spaces, but due to downsizing or new tenant configurations tenants have made them (very) small conference rooms by throwing in two chairs and small round table. I have two questions regarding these small multi-occupant spacesMulti-occupant spaces are places of egress, congregation, or where occupants pursue overlapping or collaborative tasks. Multi occupant spaces may be regularly or non-regularly occupied spaces..
1. You mention in your "bird's eye view" and Checklists sections that multi-occupant spaces should have at least two switches, however, in the reference guide (pg 399, under calculations) it states that "no specific types or numbers of controls are required." I understand that one switch may not be the flexible in large conference rooms, but these smaller conference rooms, one lighting switch appears to very flexible and it appears LEED does not have an actual standard, so they should comply with the credit?
2. At any moment one of our tenants could decide to turn these spaces back into an office, their intended use. Therefore complying the credit. Do we even need to count these as actual conference rooms?
Any thoughts would be appreciated! Thank you!
Hi Wendy, good questions.
1. You are correct. As the Reference Guide states, “no specific types or numbers of lighting controls are required.”
2. I advise treating the rooms based on their current function. As they are being used for groups of two or more to meet, they should be considered as multioccupant spaces for the calculation.
Pardon the re-post. This was included in an earlier thread but might have been over-looked:
1) Is it safe to assume that cafeterias fall under "special use spaces"? Special-use spaces mentioned were defined above as spaces "where visitors have limited access to lighting controls. In relation to this, we can claim that "staff will be available to adjust lighting conditions as necessary" since there is sufficient staff in the area to do this.
2) If not what are the requirements for this space to meet this credit for cafeterias? does the space lighting need to be zoned?
I would say a cafeteria is a special-use space, yes.
Is this credit achievable for a warehouse? The offices certainly can have controls/task lighting. But the majority of the building is high-stack racks and lighting is accomplished with natural skylights and usually high, overhead lamps. Does LEED disregard this space? It is multi-occupant and it is regularly occupied (not really an unoccupied storage space). The guide says multi-occupant spacesMulti-occupant spaces are places of egress, congregation, or where occupants pursue overlapping or collaborative tasks. Multi occupant spaces may be regularly or non-regularly occupied spaces. are "e.g., classrooms or conference areas." We do not conceive any means of bringing direct control of lighting to 50% of the warehouse occupants, primarily persons on forklifts loading/unloading from truck trailers or train cars to stacks.
Good question Sherri. As the issue is not addressed in the LEED EB O+M Reference Guide, I searched past 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 (Credit Interpretation Requests) for insight. The issue of including warehouse space is addressed in a LEED NCv2.2 CIR. The CIR response is, “Manufacturing floor, warehouse, and shipping/receiving spaces that are, in fact, regularly occupied must be considered regularly occupied for the purpose of this credit.” I understand that it may not be reasonable to allow for occupant controlled lighting, however the CIR states that “if functional or safety requirements do not allow for occupant control in majority of the spaces with 80% of the occupants, then those spaces, and by consequence, this building, does not meet the intent or the requirements of the credit.” I hope this helps.
For a warehouse or manufacturing facility with high bayA bay is a component of a standard, rectilinear building design. It is the open area defined by a building element such as columns or a window. Typically, there are multiple identical bays in succession. lighting alone, this credit may not be achievable. One strategy we've seen accepted in the past for similar project types is to provide task lighting at certain locations and different lighting controls for different sub-spaces.
The credit was documented with a detailed analysis of all spaces and functional tasks within the space and showed for each space and function the number of users, duration of use, nature of task being performed, lighting requirement (ambient only, task only, task + ambient, dimmable, high iluminance, daylight, etc), the lighting strategy provided, and the controls provided.
We are trying to certified an offices building from our company. I was considering if I need to take in account all the areas of the buiding. Icluding toilets, corridors, ... or the credit only concerns to workspaces.
In this case, Do I have to define a specific space for these uses in the form?
Thanks in advance!
Oscar, you'll find that this question is clearly answered in content available to our members above in the Checklists section.
Please review that guidance and check back with more specific questions on your project.
I was reading the requirements above, and it says for for private offices the requirements can be met with only one on/off switch. That doesn't seem very flexible for the occupant. Is this information correct? They do not require task lighting for private offices only overhead lighting?
Rachael, it seems like your question is about what is a "best practice" vs. what meets the LEED requirement.
An on-off switch meets the requirement by providing "flexibility," and so does task lighting (both discussed in a bit more detail in the Checklists section above).
To your point, I think it would be smart, however, to focus beyond LEED to what actually provides a benefit to the occupants and for energy efficiency.
Our factory is equipped with both task lights at the machinery and with overhead ceiling lights. I want to know whether is it necessary to use control switches both to those or will it be sufficient enough if we use individual controls to machine task lights?
Please submit your views on this.....
Yes, just having the ability to adjust the task lights is sufficient here. The intent is to give occupants the ability to make adjustments for comfort, but total control over on/off for the whole interior is not necessary.
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