I have used the led...here is what I did. I have 2 par 35 red, 2 blue, and one white. I have 3 little girls and veg'd them to about 9 inches then went to flower. they have started to flower now after about a month...but they dont grow much. Anyway, I am getting a 400w hps to take care of it. My advice is to spend your money on hps, and/or the ceramic mh from phillips I have read about here. You can get the 400w hps system and the 400w cmh light cuz they are interchangable. I figure it would be good for my setup, which will be 8-10 plants in the flower area (4 by 2). Anyway, hope that helps. There are a lot of great posts here on lighting by the way, you should just spend an hour or two browsing, you can get some GREAT info here!