i haven't been able to pin down an answer on the electricity issue, but would it actually be MORE efficient to have one HPS for flowering than a number of cfl's? (per light produced?)

i'm concerned about heat. it can get pretty warm here. i shouldn't have much problem pulling in air. i can have one or two big box fans in the window, and run air-tubing (what do you call that silver accordion stuff?) into the closet, but it may not be very cool air


another q: should i run fans all the time or just when lights are on?