855773644-LEED-v5-BD-C-Reference-Guide-Launch-Edition - Page 163
Extracted Content
Exemptions to uplight and light trespass requirements The following exterior lighting is exempt from the requirements, provided it is controlled separately from the nonexempt lighting:
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Specialized signal, directional, and marker lighting for transportation.
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Lighting used solely for façade and landscape lighting in MLO lighting zones 3 and 4, and is automatically turned off from midnight until 6 a.m.
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Lighting for theatrical purposes for stage, film, and video performances.
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Government-mandated roadway lighting.
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Lighting for hospital emergency departments, including associated helipads.
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Lighting for the national flag in lighting zones 2, 3, or 4.
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Internally illuminated exterior signage.
REQUIREMENTS EXPLAINED
This credit rewards projects which meet the requirements of uplight, light trespass (backlight and glare), and internally illuminated exterior signage for exterior luminaires within the project boundary. Minimizing light pollution is essential for preserving our night skies, protecting wildlife, and improving human health. Strategies include the use of light shielding, where fixtures direct light downward, reducing glare and light trespass. Using dimmers, motion sensors, and timers ensure lights are only on when needed.
Luminaires
This credit requires an assessment of all new and existing exterior luminaires within the project boundary, including any building-mounted fixtures. When performing calculations, the photometric characteristics of each luminaire must reflect the design conditions, including mounting orientation and tilt.
Determining the Lighting Zone
Classify projects under a single lighting zone, as identified in the Illuminating Engineering Society and DarkSky International (IES/IDA) Model Lighting Ordinance (MLO) User Guide [80] . Teams shall determine the project’s lighting zone based on the property classification, at the time construction begins or in accordance with MLO guidance.
80 Illuminating Engineering Society and DarkSky International (IES/IDA) Model Lighting Ordinance (MLO) User Guide, https://store.ies.org/product/ida-ies-mlo-11-model-lighting-ordinance-mlo-with-users-guide/?v=0b3b97fa6688
U.S. Green Building Council LEED v5 Reference Guide for Building Design and Construction, April 2025 Launch Edition 153