you need at least 3000LUMINS PER SQ.FT. miniume 5000 per sq.ft or more is great, no hotter than 78 lights on, no colder than 68 lights off. for four female plants a 4 ftx4 ft.x 6 ft. would be great, it all depends on how you grow and what strain,indica,sativa, i got a tent this size and have...