I have finished 2 grows using 1 ,3 x 3 x 8 room with 1, 400mh for veg. No problems. Flower room is 5 x 3 x 8 with 2,400hps and 1 ,400mh. No problems. Now Im going to move to basement. It stays 75 in the hottest summer months and probaly 55-60 in winter. I have one7 x 6 x 7 room with 1 fresh air...