like the others are saying hps lighting is by far the better for bigger yields but if you cant get rid of the heat the cfl lights are your better choice i run 400watt hps lights in coolshades and the exhaust fan removes most of the heat thu the ducting costs a bit morre to set up but produces some quality buds. when you buy your lighting look at the amount of lumens and kevins the lamps produce the higher the better and try to buy a quality reflector this will enhance the light getting to your plants