easy , watts= buds the more the better ie a more than 100w per plant or 4000 lumens per sq foot for decent plants, keeps down shoot for 74 -80 youll be good , gotta have airflow intake and exhaust, learn some techniques like super cropping fimming topping pruning and any trainings like sog scrog lst..... they help max your yield and keep the lights from 1 to 4 in away from the plants the will roast any part of the plant that it touches a good judge is putting your hand in between the plant and bulb if its hot in 15 secs the lights theres some other stuff but thats the basics bro have fun