Will this light be strong enough for my 90 gal?

[Aquattro]

I had that fixture on a 18" deep 90g. Not enough light. Not enough spread, even if you went with the 250w fixture, IMO.

I ended up going dual 400 mogul bulbs, but 250 would be fine for anything you wanted to keep. Lots of different setups available, make sure you get good light spread from the reflectors.