Thanks for the advice kindprincess, but the reason I was leaning towards the CFLs is because I already have the fixtures up and wired, and I don't think I could fit a 48 incher in there. Would the blue spectrum CFL's be just as good? I have 8 sockets wired up, do you think it would be best to put the lower wattage blue bulbs in all of them, or maybe use a few of the 42's just for the extra lumens?