^Keep those T12 within an inch of the tops of your babies, and they'll work pretty well. IMO, they'll blow away alot of the CFL setups I see here on RIU, simply because it's alot easier to get the T12's positioned correctly/optimally. More new growers should ditch the CFLs, and switch, if you ask me, especially those guys struggling with those underpowered 23 watters. Alot of the plants I see, are stretchy, and weak, due to poor light positioning. Place those plants under a cheap old shoplight, within an inch, and it'll blow 'em away.(for the first couple weeks, til 8" or so. Then the T12s become too underpowered, and the plants will start stretching excessively)
T8's work even better.