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LEED v4.1
New Construction
Indoor Environmental Quality
Interior Lighting

LEED CREDIT

NC-v4.1 EQc6: Interior lighting 1-2 points

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Kera Lagios

M.Arch, LEED AP BD+C, Assoc. IALD

atelier fos
Founder

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Credit language

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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
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 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 »

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LEEDuser expert

Kera Lagios

M.Arch, LEED AP BD+C, Assoc. IALD

atelier fos
Founder

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USGBC logo

© 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
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 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.

LEEDuser expert

Kera Lagios

M.Arch, LEED AP BD+C, Assoc. IALD

atelier fos
Founder

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