I grew one crop with a 400w HPS and got to paranoid about having it in a closet in my house because everyone who came in heard my fans runnning, so for my next crop i want to move my setup in the attic but the HPS and ballast make to much heat for me to feel comfortable leaving it on around all the insulation in my attic so i was wondering can i get the same results with CFL bulbs and do they produce much heat, also i have been hearing about the LED grow light panels has anyone heard anything on thier performance?