Hello All, I have a project that is required to meet its own jurisdictional dark sky ordinance.

Hi All, We are considering using some of up-lights to light some trees at night, I wonder if there is a way to calculate the lumens shielded by trees or by a canopy structure on top of it (very na

We have a 2 m. high brick wall running all around out site.

We are working on a rural site which will be classified as LZ1, so will not be allowed any light to be emitted above 90 degrees from nadir.

We have a govt. project that is building on a greenbuild site. The pre-development condition of the site is an LZ1. However, after the project is developed, there will be over 1m sq.

Our project has issues with the lighting on one of the facedes that exceeds the LPDs per ASHRAE.

I've looked at the annotated photometric plan example for this credit, and I noticed that at the project boundary, the vertical and horizontal footcandle values are reported as one single value. D

If we find the right kind of light fixture to be installed in the parking lot which can work well with an occupancy sensor, we will be able to reduce a lot of exterior light pollution for our proje

I tried to fiend a definition of "Shield envelope openings that have a direct line of sight to non-emergency luminaires".

We are developing a principal design for an industrial building within zone LZ2 or 3, depending on where it is located in the world.