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NC-v4 SSc6:Light pollution reduction

LEED Group project - Lighting Boundary

I have a LEED Group project where I am pursuing the Light Pollution Reduction credit.  I have a concern regarding the lighting project boundary for a LEED Group site.  Is it possible to design the lighting boundary in place of the LEED Group project boundary or along assumed project boundary of each building that is part of the LEED Group project?  More to the point, are exterior lighting fixtures that shine or face within the LEED Group project boundary (as in not in front of the boundary itself) excluded from light pollution calculation, or do they have to abide by mounting height metrics and BUG and photometric limits by assuming the project boundary for each building inside the Group project and ignoring the Group project boundary itself?

I really appreciate any help with this matter.

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Wed, 01/21/2026 - 21:28

Edgar,I'm not sure I understand the questions, and I'm not familiar with the "LEED Group" rules, BUT I think this statement in the 4.1 credit language might answer you question:
  • "When there are additional properties owned by the same entity that are contiguous to the property, or properties, that the LEED project is within and have the same or higher MLO lighting zone designation as the LEED project, the lighting boundary may be expanded to include those properties."
Also remember that only fixture with the LEED PROJECT Boundary (NOT the Lighting boundary) have to be included in your analysis:"Meet these requirements for all exterior luminaires located inside the project boundary (except those listed under “Exemptions”), "

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