I always wondered this too, how people are having to lower their lights when they switch from halides to LEDs. My sand bed is blasted with 250 PAR while the upper most part of my rock work gets almost 400 PAR. And I have coral top to bottom. Tank is 20" tall with light 8" off the water surface.
Oh, this is with my 3x250 watt halides running 14K bulbs.
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