i started 6 plants under natural light on my deck about the end of may, brought them inside about the beginning of july cuase of their size.......started growing them under 1 70w light still in veg until the last week in july when i started flowering them. Its been 2 weeks flowering and 4 of them are female and getting really pistoly. My closet is about 3w x 2d x 6h. I just recently bought another 70 watt hps and i mounted them right next to eachother with a homemade reflector hung from a 2x4 hung from the ceiling.

Im no expert but i really feel that 70 watts would be enough with limited space. Its definatly better to go overkill with light then to short shoot it.....but i mean people grow plants with flourescants, its just another experiment.