well, i bought the light from a guy that was using it as a shop light, and onthe fixture itself (its like one of the all in one things with the ballast on top of the light) it says "400w blah blah" but he uses all 175Ws in his. He has about 8 of them running at anytime in his autoshop. It has been running on 12/12 for about 2 days now and no problems so far. I have the plant in an area that is about 2.5'x2.5'x6'. It is enclosed with thick white styrofoam and cardboard atm due to me getting it on such short notice. It has adequate ventilation and sits about 80 degrees F. The plant was really droopy at first but after its first 12 hour ON cycle it has perked up and is even standing on its on now without being tied up. I will be posting some pics sometime tonight.