LEED v5 BD+C Rating System_November 2025_clean - Page 059
Extracted Content
Light Trespass
Do not exceed the following luminaire backlight and glare ratings (based on the specific light source installed in the luminaire), as defined in IES TM-15-11, Addendum A, based on the mounting location and distance from the lighting boundary. Table 2. Maximum Backlight and Glare Ratings
| Col1 | MLO Lighting Zone | Col3 | Col4 | Col5 | Col6 |
|---|---|---|---|---|---|
| Luminaire mounting | LZ0 | LZ1 | LZ2 | LZ3 | LZ4 |
| Allowed Backlight Ratings | Allowed Backlight Ratings | Allowed Backlight Ratings | Allowed Backlight Ratings | Allowed Backlight Ratings | |
| > 2 mounting heights from lighting boundary | B1 | B3 | B4 | B5 | B5 |
| 1 to 2 mounting heights from lighting boundary and properly oriented | B1 | B2 | B3 | B4 | B4 |
| 0.5 to 1 mounting height to lighting boundary and properly oriented | B0 | B1 | B2 | B3 | B3 |
| < 0.5 mounting height to lighting boundary and properly oriented | B0 | B0 | B0 | B1 | B2 |
| Allowed Glare Ratings | Allowed Glare Ratings | Allowed Glare Ratings | Allowed Glare Ratings | Allowed Glare Ratings | |
| Building mounted > 2 mounting heights from any lighting boundary | G0 | G1 | G2 | G3 | G4 |
| Building mounted = 1–2 mounting heights from any lighting boundary | G0 | G0 | G1 | G1 | G2 |
| Building mounted = 0.5–1 mounting heights from any lighting boundary | G0 | G0 | G0 | G1 | G1 |
| Building mounted < 0.5 mounting heights from any lighting boundary | G0 | G0 | G0 | G0 | G1 |
| All other luminaires | G0 | G1 | G2 | G3 | G4 |
AND
Internally Illuminated Exterior Signage
Do not exceed the maximum luminance level of internally illuminated signage during nighttime hours according to Table 3.
Table 3. Maximum sign luminance
| MLO Lighting Zone | Signage Light Output |
|---|---|
| LZ0 | 50 cd/m2 |
LZ1 | 50 cd/m2 |
LZ2 | 100 cd/m2 |
LZ3 | 200 cd/m2 |
LZ4 | 350 cd/m2 |
U.S. Green Building Council LEED v5 Reference Guide for Building Design and Construction, November 2025 Edition 52