ND-Plan-v4 GIBc17: Light pollution reduction

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  • GIB Credit 17: Light pollution reduction

    Intent

    To increase night sky access, improve nighttime visibility, and reduce the consequences of development for wildlife and people.

    Requirements

    Meet the Light Pollution Reduction requirements for the following:

    1. One option in Exterior Lighting for Residential Areas
    2. Exterior Lighting for Circulation Network
    3. Uplight and light trespass requirements in Exterior Lighting for All Other Areas
    4. Covenants, Conditions, and Restrictions.

    Divide the project into model lighting ordinance (MLO) lighting zones LZ0 to LZ4 based on site-specific characteristics using the definitions of lighting zones provided in the Illuminating Engineering Society and International Dark Sky Association (IES/IDA) MLO User Guide.

    Meet the requirements below for each lighting zone within the project.

    Exterior lighting for residential areas

    Meet either Option 1 or Option 2 for all exterior lighting in new residential construction and residential buildings undergoing major renovations. Existing residential construction is exempt.



    Option 1. BUG rating method

    Each fixture must have a backlight-uplight-glare (BUG) rating (as defined in IES TM-15-11, Addendum A) of no more than B2-U2-G2.

    OR
    Option 2. Calculation method

    Meet the requirements of Option 2 in Exterior Lighting for All Other Areas, below.


    Exterior lighting for circulation network

    For any portions of the circulation network not governed by national, state, or other superseding regulations, do not install street lighting unless conditions warrant the need for street lighting.

    New and existing street lighting luminaires must not emit any light above 90 degrees (horizontal), based on the photometric characteristics of each luminaire when mounted in the same orientation and tilt as specified in the project design or as currently installed.

    Exception for ornamental luminaires: Using the lowest MLO lighting zone for immediately adjacent properties, meet the requirements of the IES/IDA MLO, Table H.

    AND

    Exterior lighting for all other areas

    Use either the BUG method (Option 1) or the calculation method (Option 2) to meet uplight and light trespass requirements. Projects may use different options for uplight and light trespass.

    Uplight
    Option 1. BUG rating method

    Do not exceed the following luminaire uplight ratings, based on the specific light source installed in the luminaire, as defined in IES TM-15-11, Addendum A.

    Table 1. maximum uplight ratings for luminaires, by lighting zone

    MLO lighting zone Luminaire uplight rating
    LZ0 U0
    LZ1 U1
    LZ2 U2
    LZ3 U3
    LZ4 U4



    OR
    Option 2. calculation method

    Do not exceed the following maximum percentages of total lumens emitted above horizontal.

    Table 2. Maximum percentage of lumens above horizontal, by lighting zone

    MLO lighting zone Maximum allowed percentage of total luminaire lumens emitted above horizontal
    LZ0 0%
    LZ1 0%
    LZ2 1.5%
    LZ3 3%
    LZ4 6%



    Light trespass
    Option 1. BUG Rating Method

    Do not exceed the following luminaire backlight and glare ratings (based on the specific light source installed in the luminaire) as defined in IES TM-15-11, Addendum A, based on the mounting location and distance from the lighting boundary.

    Table 3. Maximum backlight and glare ratings

      MLO lighting zone
    Luminaire mounting LZ0 LZ1 LZ2 LZ3 LZ4
      Allowed backlight ratings
    > 2 mounting heights from lighting boundary B1 B3 B4 B5 B5
    1 to 2 mounting heights from lighting boundary and properly oriented B1 B2 B3 B4 B4
    0.5 to 1 mounting height to lighting boundary and properly oriented B0 B1 B2 B3 B3
    < 0.5 mounting height to lighting boundary and properly oriented B0 B0 B0 B1 B2
      Allowed glare ratings
    Building-mounted > 2 mounting heights from any lighting boundary G0 G1 G2 G3 G4
    Building-mounted 1–2 mounting heights from any lighting boundary G0 G0 G1 G1 G2
    Building-mounted 0.5 to 1 mounting heights from any lighting boundary G0 G0 G0 G1 G1
    Building-mounted < 0.5 mounting heights from any lighting boundary G0 G0 G0 G0 G1
    All other luminaires G0 G1 G2 G3 G4



    A lighting boundary (or boundaries) is defined as the perimeter of each lighting zone within the project boundary. A lighting boundary can be modified under the following conditions:

    • When the property line is adjacent to a public area that is a walkway, bikeway, plaza, or parking lot, the lighting boundary may be moved to 5 feet (1.5 meters) beyond the property line;
    • When the property line is adjacent to a public street, alley, or transit corridor, the lighting boundary may be moved to the center line of that street, alley, or corridor;
    • When there are additional properties owned by the same entity that are contiguous to the property, or properties, that the LEED project is within and have the same or higher MLO lighting zone designation as the LEED project, the lighting boundary may be expanded to include those properties.

    Orient all luminaires less than two mounting heights from the lighting boundary such that the backlight points toward the nearest lighting boundary line. Building-mounted luminaires with the backlight oriented toward the building are exempt from the backlight rating requirement

    Option 2. calculation method

    Do not exceed the following vertical illuminances at the lighting boundary of each lighting zone in the project (use the definition of lighting boundary in Option 1). Calculation points may be no more than 5 feet (1.5 meters) apart. Vertical illuminances must be calculated on vertical planes running parallel to the lighting boundary, with the normal to each plane oriented toward the property and perpendicular to the lighting boundary, extending from grade level to 33 feet (10 meters) above the height of the highest luminaire.

    Table 4. maximum vertical illuminance at lighting boundary, by lighting zone

    MLO lighting zone Vertical illuminance
    LZ0 0.05 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. (0.5 luxMeasurement of lumens per square meter.)
    LZ1 0.05 fc (0.5 lux)
    LZ2 0.10 fc (1 lux)
    LZ3 0.20 fc (2 lux)
    LZ4 0.60 fc (6 lux)





    FC = footcandle

    Exemptions from uplight and light trespass requirements

    The following exterior lighting is exempt from the requirements, provided it is controlled separately from the nonexempt lighting:

    • specialized signal, directional, and marker lighting for transportation;
    • internally illuminated signage;
    • lighting that is used solely for façade and landscape lighting in MLO lighting zones 3 and 4 and is automatically turned off from midnight until 6 a.m.;
    • lighting that is integral to other equipment or instrumentation that has been installed by the equipment or instrumentation manufacturer;
    • lighting for theatrical purposes for stage, film, and video performances;
    • street lighting;
    • hospital emergency departments, including associated helipads; and
    • lighting for the national flag in MLO lighting zones 2, 3, or 4
    Covenants, conditions, and restrictions

    Establish covenants, conditions, and restrictions (CC&R) or other binding documents that require continued adherence to the above requirements.


1 Comments

0
0
William Gagnon Sustainable Development Coordinator Provencher Roy Associés Architectes Inc.
May 11 2017
Guest

CC&R

Project Location: Canada

Hello,

Any examples of CC&Rs relative to light pollution reduction? I don't want to specify directly to a standard or to the LEED ND reference guide since it would be too prescriptive to be included in the by-laws. Summarize the credit in my own words?

Any examples?

Thank you for your help!

William Gagnon

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Jun 29 2017
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