well the space i use for growing is a 2 x 2 space but the closet is much longer. i have my veg space next to my floweering space. the space all together is 2 x 5 1/2. and i do have an air cooled reflector going on the 600 watt hps and i use a 250 watt metal halide for my veg and that one doesnt get to hot and its always vented into the main room.