Gunna look into some Mylar for the next grow box I make when she gets a lil bigger, I have a computer fan blowing on her so she dosent get too hot, nd the cfl hardly gives off any heat anywayThe aluminum foil is bad. You can get mylar cheap as hell and its exponentially better for light reflection. Aluminum foil mainly reflects heat. Obviously it does reflect light, but at a cost. Grab some mylar from a dollar store or you can use emergency blankets from wal mart. They prob cost more though.