CI-v4.1 EQc6: Interior Lighting 1-2 points
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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 less than 19 using software modelling calculations of the designed lighting.
Exceptions include wallwash fixtures properly aimed at walls, as specified by manufacturer’s data, indirect uplighting fixtures, provided there is no view down into these uplights from a regularly occupied space above, and any other specific applications (i.e. adjustable fixtures).
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 all regularly occupied 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
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LEEDuser overview
Frank advice from LEED experts
LEED is changing all the time, and every project is unique. Even seasoned professionals can miss a critical detail and lose a credit or even a prerequisite at the last minute. Our expert advice guides our LEEDuser Premium members and saves you valuable time.
For full access, sign up now for LEEDuser Premium
Already a premium member? Log in now
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 less than 19 using software modelling calculations of the designed lighting.
Exceptions include wallwash fixtures properly aimed at walls, as specified by manufacturer’s data, indirect uplighting fixtures, provided there is no view down into these uplights from a regularly occupied space above, and any other specific applications (i.e. adjustable fixtures).
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 all regularly occupied 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.