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Credit language

© Copyright U.S. Green Building Council, Inc. All rights reserved.
Intent
To promote occupants’ productivity, comfort, and well-being by providing high-quality lighting.
Requirements
Meet 1 strategy for 1 point. Meet 3 strategies total for 2 points.
1. Glare Control
For all regularly occupied spaces, meet one of the following requirements:
- Use light fixtures with a luminance of less than 7,000 candela per square meter (cd/m)2 between 45 and 90 degrees from nadir. OR
- Achieve a Unified Glare Rating (UGR) rating of
2. Color Rendering
For all regularly occupied spaces meet one of the following requirements:
- Use light sources that have a Color Rendering Index (CRI) of at least 90.
- Use light sources that have a Color Fidelity Index greater than or equal to 78 and a gamut index between 97 and 110, determined in accordance with Illuminating Engineering Society (IES) TM-30.
3. Lighting Control
Provide dimmable or multilevel lighting for 90% of occupant spaces.
4. Surface Reflectivity
For at least 90% regularly occupied spaces, use interior finishes with a surface reflectance greater or equal to 80% for ceilings and 55% for walls. If included in the project scope, use furniture finishes with a surface reflectance greater or equal to 45% for work surfaces and 50% for movable partitions.
India ACP: Interior Lighting
I. Projects in India may, in all regularly occupied spaces, meet or exceed the lower illuminance levels listed in the Bureau of Indian Standards (BIS) code -- IS 3646 (Part 1): 1992, Table 1- Recommended Illumination. See all forum discussions about this credit »What does it cost?
Cost estimates for this credit
On each BD+C v4 credit, LEEDuser offers the wisdom of a team of architects, engineers, cost estimators, and LEED experts with hundreds of LEED projects between then. They analyzed the sustainable design strategies associated with each LEED credit, but also to assign actual costs to those strategies.
Our tab contains overall cost guidance, notes on what “soft costs” to expect, and a strategy-by-strategy breakdown of what to consider and what it might cost, in percentage premiums, actual costs, or both.
This information is also available in a full PDF download in The Cost of LEED v4 report.
Learn more about The Cost of LEED v4 »Frequently asked questions
See all forum discussions about this credit »Documentation toolkit
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© Copyright U.S. Green Building Council, Inc. All rights reserved.
Intent
To promote occupants’ productivity, comfort, and well-being by providing high-quality lighting.
Requirements
Meet 1 strategy for 1 point. Meet 3 strategies total for 2 points.
1. Glare Control
For all regularly occupied spaces, meet one of the following requirements:
- Use light fixtures with a luminance of less than 7,000 candela per square meter (cd/m)2 between 45 and 90 degrees from nadir. OR
- Achieve a Unified Glare Rating (UGR) rating of
2. Color Rendering
For all regularly occupied spaces meet one of the following requirements:
- Use light sources that have a Color Rendering Index (CRI) of at least 90.
- Use light sources that have a Color Fidelity Index greater than or equal to 78 and a gamut index between 97 and 110, determined in accordance with Illuminating Engineering Society (IES) TM-30.
3. Lighting Control
Provide dimmable or multilevel lighting for 90% of occupant spaces.
4. Surface Reflectivity
For at least 90% regularly occupied spaces, use interior finishes with a surface reflectance greater or equal to 80% for ceilings and 55% for walls. If included in the project scope, use furniture finishes with a surface reflectance greater or equal to 45% for work surfaces and 50% for movable partitions.