Have you tried contacting any of the LED manufacturers? They might be able to tell you better than anyone on here.
Personally I have Radions hanging about one foot above the water and and 29 inches of water to the sand bed. My LPS on the sand bed are thriving and the lights are not at 100% power.
Personally I have Radions hanging about one foot above the water and and 29 inches of water to the sand bed. My LPS on the sand bed are thriving and the lights are not at 100% power.
