When Dakar (Dave) first started this post I believe that he said the LED's put a light pattern out to about 8" to 9" inches. Dave if you let use know what the depth of the water was that will give me an idea of how many LED's an individual would want to run in a line so the lights are no overlapping by to much and they don't make up the Moonlight to bright. Remember we are trying to just give enough light to let the corals think it is night time. The Moonlights are not meant to be bright, just a soft light to make to corals and other animals think it is night time so they will come out to feed like in nature.

Bob