i find that 6 plants in 5 gallon buckets is about as much as you want to put under one 600. yup theres no way your going to pull 5 oz a plant.espescially with a 600 or 3 600's.there's just not enough lumen output to creat as many nodes to support that much weight.unless you chose a verry high yielding strain "usually sacrifice quality" and a baddass 14 part nutrient program,like advanced nutrients. you would really need to be on the ball with your feeding and have a super keen eye to achieve those goals.good luck though