I'm new to LED lighting too and have done a fair bit of research on the units available.
As far as I'm aware the two units with the largest spread are the GHL Mitras and the AI Hydra 52, both offering around a 36" spread.
If you have a 90 cube then one of these fixtures will cut it. However, of you have a 48" tank then I don't know that you will get away with a single fixture.
I don't have much experience in many of the other fixtures available which are bigger units but hopefully someone else can chime in there.
Dunc
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