whats the avg temp in that closet with the lights on up to 24 hrs?

i would recomend a the trouble shoot form so we know what you are working with then some one might be able to help..that foil is only going to reflect heat. so it it gets below 70F then id loose the foil. Mylar (emergency blankets from spoorting good stores)works better. CFLs are not strong enough to be reflected that much. like cangrowit sait up there, there is about a 5 inch rance for good useable light from a CFL. Good thing they are cheap!!