one radion over a 90g?

I have 1 radion over a 36 x 18 x 20 and it works great. Regular lenses and about 12" off water. I think 90g 48" tank would be to much for 1 though.
 
1 was not enough for good even light over my 40B, even with the wide angle lenses the sides of the tank were dim and I had a lot of shadowing. I think ecotech recommended 2'x2' for coverage. It was bright enough, just not wide enough for my taste.
 
I don't have Radions but I use AI SOLs. My 90g is 3 x 2 x 2 and I have 4 over my SPS tank and am still considering adding a couple T5s.
 
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