If I where you I'd stay away from the bigger cfls, and just use some HO T5's, I just feel like they cover more space, plus i've seen a few grows that where grown entirely under T5's and they look way more amazing than just CFL's, I used to grow with cfls I had 4x 40w CFLs, they yield decent airy-ish buds, but the only problem is finding where to place them so you can get the most out of,
I just feel more comfortable under a T5 fixture because I don't have a whole bunch of extension cords & light sockets to deal with, Which I feel like is a fire waiting to happen