how big of a space are u using it in. are they a bunch of spiral cfls? or are they a nice set of t5s or something? cfls are great in large numbers. i have about 350 watts worth of cfls in my 2x2 veg box. mixed spectrum 2/3rds are 65k temp and the othe 1/3 are 27k temps for a dual spectrum thing. promotes healthier and stronger growth ive noticed.