Newbie at it again!

Stay away from Power Compacts unless its like a really good deal or something they have less PAR than T5's.

The perfect fixture for you would be a 250w MH. See if you can find something like that. If you can't you can even look into the retro fit equipment like Biff said. Buy a ballast, pendant reflector, and a bulb. Wire it up yourself.
 
Yes, power compacts don't fit the watts per gallon rule, because they put out less usable light per watt than T5s and MH do. They are weak lights and not very popular in the hobby anymore.
 
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