My tank is 36" by 18" and my Radion it's mounted 12" off the water. It spreads to the edges with almost no falloff. Even at this height, par is in the 200s at center and 100s at the tank ends. If you don't mind some dim areas at the ends, I would say you could bring it down another 4".
Michael Rice
Marine Engineers Aquarium Blog
Sent from Tapatalk so excuse my poor English
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