LEED Sustainable Sites
SS Credit 8: Light Pollution Reduction
The intent of this credit is 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 on nocturnal environments.
Requirements for Certification:
Verify light trespass requirements are met by providing site plan showing initial horizontal and vertical footcandles. Provide catalog cut-sheets of all site and building mounted luminaires.
Successful Strategies:
- Minimize site lighting where possible
- Full cutoff-luminaries
- Low-reflectance surfaces
- Low-angle spotlights
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Helpful Hints:
- Exterior luminaires with lamps over 1,000 lumens must be shielded and those with lamps of 3,500 or more lumens must be full cutoff fixtures, as defined by IESNA.
- If city street lights are being installed as part of the project scope and they are located within the project's site boundary, these fixtures must comply with credit requirements.
- In campus settings, a project need not have zero footcandles at the site boundary and can take a comprehensive approach to the campus lighting plan. See the LEED Campus Application Guide for more details.
- Projects should be especially cautious with monument, flagpole and signage lighting, artistic or building up lighting and landscape up lighting.
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Historical Data (updated June 2006):
- Five California LEED v2.1 certified buildings have achieved this credit.
- 30% of all California LEED Certified projects achieved this credit for LEED v2.1.
- 30% average electricity savings is estimated for projects attaining this credit.
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