Roland I have 2 dm155e that are currently on my 40x 36 x 22 tank they won't cover that large of a space but I had spoken to rick and was aware of it up front. They will no doubt cover a 90. I was going to buy radions for the new build which is a 90 but only because I wanted to control them . I ordered the parts today to upgrade my lights to apex control. This light is very bright . I had a 400 w halide and these bleached a hammer until I dialed it back now it coming back around

I also transferred all my corals from under T5HO. Now being kept under the Pro 180. These lights are powerful! Start low! Be patient! Give your eyes time to adjust to the very big difference between LED's and T5. It's hard I know

