Would appreciate very much if anyone can clarify that the maximum allowed percentage of total lumens emitted above horizontal (by lighting zone) is applied to each luminaire or the sum of all lumen

Is there a definition of nightime hours for internally illuminated signage? I would assume midnight to 6 AM as in the excemption for facades but I can't find any statement.

Hi all, Is "Specialized transportation signal, directional & marker lighting" subject to the interior lit exterior sign illuminance limits?

This may be an academic question but I am unsure on the wording. The modification of the lighting boundary depends on adjacency to a walkway or a public street.

Who determines the exterior lighting zone LZ0-LZ4 for a LEED project? I am working on a project in a state that isn't mine and I don't know much about the city.

If I understand the LEED requirements for exterior lighting, we will be following the BUG guidelines for all lighting that will remain on from sunset to sunrise.

Am I missing something or does v4 no longer have any requirement on interior lighting that has a significant uplighting component? We have an interior atrium that will have this issue - and it jus

I just had this come up on a project. The reviewer will only allow me to count hardscape area for the LPD table if that area has over 0.2 fc.

Is existing lighting required to be included in the BUG rating prescriptive method? We have a project where only some site lighting is being upgraded; the rest will remain.

I saw a similar question regarding uplight, but is it possible for a building-mounted light fixture to be excluded from the glare requirements if it is shielded from the lighting boundary by anothe