how to tell if male or female

i was wondering how u can tell if its a male or female in the early stages? and when u should switch it over to hps. and how much plants would a 150hps grow??

impossible to tell in the early stages.. u must wait for the preflowers or force flower.. you should switch over to a hps.. when ur plants are ready to flower.. and that 150 question is pretty vague.. it all depends on size of grow area, reflectivity.. and a number of other things but i would say two.. any more then that ud get skimpy nugs..

thanks
closet, 5 feet tall, about 4 wide, 2 in

yes with good reflectvity you should be able to grow two ..in that size...