855773644-LEED-v5-BD-C-Reference-Guide-Launch-Edition - Page 495
Extracted Content
AND/OR
PATH 2. QUALITY ELECTRIC LIGHTING (1 POINT)
Comply with the following requirements for regularly occupied spaces:
Electric light glare control Each luminaire shall meet one of the following requirements:
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Have calculated luminance of less than 6,000 candela per square meter (cd/sq. m.) between 45 and 90 degrees from nadir.
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Achieve a unified glare rating (UGR) of 19 or lower using the UGR tabular method for each space.
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Achieve a UGR rating of 19 or lower using software modeling calculations of the designed lighting. (Modeling must be performed as outlined in the NEMA White Paper on Unified Glare Rating [160] ).
Color rendering Use luminaires that have a color rendering index of at least 90, or that meet the color rendering requirements in Table 1, in accordance with Illuminating Engineering Society (IES) TM-30-20.
Table 1. Color rendering requirements using TM-30-20
| Measure | Col2 | Requirement |
|---|---|---|
| Fidelity index | Rf | 78 or higher |
| Gamut index | Rg | 95 or higher |
| Red Local Chroma Shift | Rcs,h1 | -1% to 15% |
AND/OR
PATH 3. PROXIMITY TO WINDOWS FOR DAYLIGHT ACCESS (1 POINT)
Design the interior layout to provide at least 30% of the regularly occupied area to be within a 20-foot (6 meters) horizontal distance of envelope glazing. The glazing must have a visible light transmittance above 40%. Regularly occupied areas with visual obstructions (incapable of providing a view to envelope glazing) should be excluded from the compliant area.
OR
160 “NEMA White Paper on Unified Glare Rating”, NEMA, (2021), accessed March 21, 2025, https://www.nema.org/standards/view/white-paper-on-unified-glare-rating-(ugr)
U.S. Green Building Council LEED v5 Reference Guide for Building Design and Construction, April 2025 Launch Edition 485