855773644-LEED-v5-BD-C-Reference-Guide-Launch-Edition - Page 511
Extracted Content
Table 8. Color rendering requirements for TM-30 method
| Measure | Col2 | Requirement |
|---|---|---|
| Fidelity index | Rf | 78 or higher |
| Gamut index | Rg | 95 or higher |
| Red Local Chroma Shift | Rcs,h1 | -1% to 15% |
PATH 3. PROXIMITY TO WINDOWS FOR DAYLIGHT ACCESS
This path involves designing the building floorplates and interior layout to have regularly occupied areas located in close proximity — within 20 feet (six meters) — of envelope glazing (e.g., windows, curtain walls, or other transparent elements in the building façade). The 30% threshold serves as a baseline or entry-level standard that aligns with WELL v2 Precondition L01 — Light Exposure, encouraging projects to incorporate daylight access into the design. [182] Projects aiming for more extensive daylighting strategies should explore Path 4. Daylight Simulation.
PATH 4. DAYLIGHT SIMULATION
Daylight is dynamic and highly dependent on local climate and site conditions, with daily and seasonal variations. These dynamic qualities can be explored during the design process using daylight simulation tools and daylight performance metrics standardized by the daylight design community. Incorporating simulation early in the design phase supports the optimization of building form, window placement, façade elements, and interior configurations to achieve the best possible balance of natural light.
Occurrences of direct sunlight can be minimized with thoughtful design, but daylight glare and reflections will likely still be needed and desired by occupants for certain parts of the day or year. For this reason, it is highly recommended to also pursue Option 5. Path 1. Solar Glare.
This path uses a tiered point system with four thresholds of increasing stringency based on spatial Daylight Autonomy (sDA) calculations, indicating how much of a space receives sufficient daylight throughout the year. According to research conducted under the Illuminating Engineering Society’s LM-83 standard [183], spaces with sDA values of 75% or higher provide preferred levels of daylight, while spaces with sDA values between 55% and 75% achieve nominally acceptable daylight levels. The credit’s highest point threshold aligns with this research by requiring the preferred sDA level of 75% or greater.
182 WELL Standard v2, https://v2.wellcertified.com/en/wellv2/light/feature/1. 183 Illuminating Engineering Society LM-83 Standard, https://store.ies.org/product/approved-method-ies-spatial-daylight-autonomysda-and-annual-sunlight-exposure-ase/?v=0b3b97fa6688
U.S. Green Building Council LEED v5 Reference Guide for Building Design and Construction, April 2025 Launch Edition 501