right now i have the 250 mh with 100 watts of cfls. in dwc. the only other light i have is the 600 hps. temps hit range from 70-82 at the most. but it is still cold out hear and i do find myself opening the window sometimes already. i was gonna use ac during the summer in my bedroom. my plants are in my closet. so you guys think the 600 is too much for this space? probably i was thinking the same thing. i guess it wont hurt to try. also im growing 3 sweet seeds fast bud autos, 1 il diovolo Auto, a white widdow big bud cross, and an ak47. so 6 plants all feminized.