Hallo Bill, The Reference Guide mentions "Software is also available that will calculate the BUG rating using the IES file for the luminaire." Would you please share with us what software the guid

Hi Bill - Perhaps you can help me with this. The RG states a requirement of 200 cd/m2 (nits) for nighttime hours and 2000 nits during daytime hours for Internally Illuminated Exterior Signage.

In LEED v2009 there is mentioned the following about the lighting boundary: illuminance generated from a single luminaire placed at the intersection of a private vehicular driveway and public roadw

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