i have a 400 watt HPS that i will be using for the whole thing, i may even go and get a 1000watt baby but at the moment this will work just fine. this is my first time growing hindu kush, as well as my first time ordering from nirvana, I had an exelent experence with them and a great germ. rate as well. as far as the grow space goes i have a room that is 11x12, so plenty of space.