i have i have 11 150 watts in a 5'3" x 31" gr and with no vent i'm gettin low to mid 80's, they can get pretty hotI have my CFL's 2 inches from the tops of the plants....thats the whole point of CFL...they dont produce much heat and can be placed very close to the plants with out fear of burning. Move those babies close and watch those colas grow!!
good, a hydroponic store sells them... you have to buy the regulator though... i paid 400 for the reg and the tank