I have been, and always will use florescent lights to clone and veg. No problems there as long as you keep them close. But after this last grow, using CFLs to flower, I will never flower under florescents again. Under HPS I average 1.5 ounces per plant, after I cut out all the stems. Under CFLs I got barely over 2 ounces from SIX plants. It was still good smoke, but the buds didn't weigh shit. It was a hell of a hit to my wallet, and is an experament that I will not try again. I will use the CFLs as supplemental lighting, because I have them now, but will never again use them as a primary light source for flowering. There is a reason all of the big growers use HPS, they just work the best. That is, if you want big dense buds.