i just switched the lights from mh to hps. and now the plants seem to be no liking it. they are all wiliting. the lights were 6 inchs away. so than i raised to a foot above the plants. not sure if that is to far a way for 1 150 hps. i have it in a 2x2x4 box. with i 5 inch exhaust with 2 turbo fans in there. with 6 1/2 holes around the base of the box for fresh air. its only about 80 in there. what do u guys think. sorry no pics