855773644-LEED-v5-BD-C-Reference-Guide-Launch-Edition - Page 165
Extracted Content
For projects located in MLO Lighting Zones LZ0 or LZ1, teams must use luminaires with an uplight rating of U0.
For projects in MLO Lighting Zones LZ2, LZ3, or LZ4, luminaire uplight ratings cannot exceed U2, U3, and U4, respectively.
Light Trespass Requirements
Light trespass is a form of light pollution where unwanted artificial light spills over into areas where it is not intended or needed, often causing disturbances. This can happen when outdoor lighting, such as floodlights or streetlights, illuminate neighboring properties or shine into other property windows.
Fixture Location and Mounting Heights A common reason for light trespass typically includes poorly shielded lighting located too close to property lines. To minimize lighting trespass, examine luminaire spillage along with the location of the exterior luminaire. This requires a review of the location and mounting height for each luminaire.
Identify the location of all exterior lights on a site lighting plan and measure the horizontal distance from the lighting boundary. Then, determine the mounting height of each luminaire. The mounting height of the exterior luminaire is the vertical distance from the reference plane (i.e., the ground surface).
Determining the Maximum Backlight and Glare Requirements Table 2 defines the maximum allowed backlight and glare ratings, per lighting zone. The team determines backlight and glare ratings per luminaire by using the mounting height and the distance from the lighting boundary. The closer the luminaire is to the boundary, the stricter the requirements.
Exemptions for Uplight and Light Trespass
Specific fixtures are exempt from the light trespass requirements due to their critical functions and unique needs. Identify fixtures that meet these exemptions. Control any exempt fixtures separately from non-exempt fixtures.
Transportation and roadways Specialized signal, directional, and marker lighting for transportation fixtures ensure safety and proper navigation for vehicles, aircraft, and ships. Government-mandated roadway lighting provides necessary illumination for public safety on roads and highways.
U.S. Green Building Council LEED v5 Reference Guide for Building Design and Construction, April 2025 Launch Edition 155