Hi, gang, One of our lighting designers is very frustrated with the LEED requirements for light trespass at the boundary, specifically where the driveway goes from the public road onto our site.

Hi, can anyone please comment/confirm that Dialux software can be used to work out the credit requirements with regards to exterior ligting?

How does this credit take into consideration lighting for comfort?

The contractor on a LEED site would like to put a billboard up.

I'm note sure to understand the fourth demand of this credit.

I have a adjustable fixture mounted on the ground to uplight the tree. The initial fixture lumen above 90 degrees from nadir is 0 which is full cut off fixture.

city owned lights are not included in our photometric calculations, but how in reality can somebody check that the lights are matching our calculations if the city-owned lights are there anyways?

project is along an arterial road with lots of city lights.

Dear all, In a situation where there are some spot lamps for emergency maintenance that can emit upward lights but used only for max.

Can I use the ASHRAE table and methodology of demonstrating LPD compliance?