if your looking for uv rays, i heard the ceramic metal halides are the way to go. you only supposed to use them for the last two weeks of flowering though! im not sure about your cfl's, probably just a way to sell cfl's for more money. i could be wrong, just my guess. i would just spend a dollar per cfl and get ten cfl's instead of one of those. but you can do w/e you want! alot of ppl have good luck with hps! 110 dollars you can get a 400w hps system! lateranyone?????????????????