855773644-LEED-v5-BD-C-Reference-Guide-Launch-Edition - Page 162

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, April 2025 Launch Edition 152