Yeah I have my grow bars. Right now I'm only growing legal stuff due to a recent scare. I'm currently using my 200 watt CFL in order to keep my box warm, but I plan to start using the LEDs in about a month. I can't risk just using LEDs right now because I've got an expensive kratom plant cutting on like life support in my box that needs high temperatures. I did try the LEDs for a few days though so I can tell you a little about them. They do give off a slight amount of heat, maybe enough to raise the temperature of a small grow box with very little ventilation a few degrees. The bars seem to be of great quality, although the power adapters are a bit crappy. You can run up to eight bars off of one adapter. Alot of the light that they emit is not visible to the human eye so you won't get much light leakage out of grow areas, but the downside to this is that you'll probably want to have a cfl as well in order to see your plants adequately. Unless your house is well insulated and has good climate control you'll probably want to use LEDs during the warm months only, or use a heater or something to heat your grow area.