855773520-LEED-v5-ID-C-Reference-Guide-Launch-Edition-1 - Page 328
Extracted Content
-
Achieve a unified glare rating (UGR) of 19 or lower using the UGR tabular method for each space.
- 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 [121] .)
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
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:
-
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.
-
For any regularly occupied spaces with ASEnet(1000,250h) greater than 20%, identify how the space is designed to address glare.
-
Calculate the average sDA 300/50% or sDA 150/50% for the total regularly occupied floor area. Do not exclude spaces based on ASE. Points are awarded based on this calculation, according to Table 2.
121 “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 Interior Design and Construction, April 2025 Launch Edition 317