LEED v5 BD+C Rating System_November 2025_clean - Page 172
Extracted Content
- Achieve a UGR of 19 or lower using the software modeling calculations of the designed lighting. Modeling must be performed as outlined in the NEMA White Paper on Unified Glare Rating. [6]
Color rendering Use luminaires that have a color rendering index of at least 90 or that meet the color rendering requirements in Table 3, in accordance with Illuminating Engineering Society (IES) TM-30-20 .
Table 3. Color Rendering Requirements Using IES 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 building floorplates and interior layout to provide at least 30% of the regularly occupied area to be within a 20-foot (6-meter) 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
PATH 4. DAYLIGHT SIMULATION (1–4 POINTS)
Perform a daylight simulation analysis for the project to understand and optimize access to daylight and visual comfort. Use the calculation protocols in IES LM-83-23 with the following clarifications:
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Calculate s patial daylight autonomy300/50% (sDA300/50%) and annual sunlight exposure1000,250 (ASE1000,250) as defined in IES LM-83-23 for each regularly occupied space in the project. sDA 150/50% may be used for areas without visual tasks with design targets of 225 lux.
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For any regularly occupied spaces with ASEnet(1000,250h) greater than 20%, identify how the space is designed to address glare.
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Calculate the average sDA 300/50% or sDA 150/50% for the total regularly occupied floor area. Do not exclude spaces due to ASE. Points are awarded based on this calculation, according to Table 4.
6 NEMA, “White Paper on Unified Glare Rating.” 2021,
U.S. Green Building Council LEED v5 Reference Guide for Building Design and Construction, November 2025 Edition 165