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Not sure, but the LEDs I purchased for my 90 gal. have 90 degree. I hang them around 8" above the water and there's no light spilling out. I believe others have the same fixtures around 10".
I'd go with the 90. I'm running two ai sol blues over my 75. The middle pucks are 40 and and really push a lot of light down. I could change them out but I just place corals accordingly.