Well I've got a 400 cooltube in a DR60 street for veg and it rocks. :muscle Gonna try flowering in it soon just to see how much i can get outta it. I also ran a 600 cooltube in a DR120 and it made real fat dense buds, sorta shocked me how fat they were cuz i wanted to put a 1000 in there lol. As long as you have a good air exchange a 600 would be good, in a wing stylee reflector too spread the light out a bit, should be good to go.