Originally posted by jedininja
The mogul is what you screw the bulb into. I run a dual 175 on my 75 gallon. But i run mostly softies, so it works out well. If you are going for acros then go 250, if not 175 is perfect.
I guess I should have been more clear. I know what it is, but there are different versions of the "thing you screw your bulb into." e.g. double ended halides.