When I first installed my Radions, I started them at 30%, and they were still brighter than my old T5's. I then raised it to 40%, but noticed that my corals were shrinking a bit, so I dialed them back to 30%. Since I don't have any SPS (only softies and LPS), I thought I would go even lower and see how they do. I am currently running them at 20%, and corals are doing better than ever now. Seems like my softies just don't like bright light.
I have a 6ft tank, 18" deep, with 3 Radions 8" above the water. I use the natural mode setting, so it gradually ramps up and peaks at mid day, and then down again to dusk. Then a low blue for moonlight thru most (totally off for about 3 hours) of the night.
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