As a person that previously owned a 93 cube (great tank btw), I had 2 of the 250w equivalent chinese black box LEDs with two 24" twin tube T5s ( one down each side) over mine. It's a tight fit but it will fit an I had really good growth with that amount of light.
I have two of the dimmable evergrow fixtures over my 93 cube. Great fixture and lights up the tank better than the 400w halide I replaced. Only running white/red/green at 50% and blues at 75%. I don't have much SPS though.