Hi,
I hope to be the barren of good new for yea! After a few years of experience with this one strain I have, I always flowered out 21-24 plants in two rooms. Each room had two 600HPS and two 1000HPS. I used two gallons and three gallons but always all three or all two in one room at one time-I never mixed two and three gallons in one room. I always ranged from 3-4.5 Oz a plant with this set up. It all really depends on variables etc. No bullshit. Questions on set up or details, u can ask. My system is different now. NOt because I was getting over 5LB on 3200Watts, but because I grow al year, and even in Canada it gets +35 C out. So in the summer is tough, now I use Aircool shades and added more lights
But I keep 600HPS open.
BTW, I don't mess around with any stress, or toping or oversized grow bags and hardly fill with dirt but use it for it's wider bottom circumference, I also dont use big pots like 5 gallons since those are a waste of time! I also do it with avg 27 daays veg but done mostly under one 600HPS and in six inch pots, than transplant into two gallons or three and veg for about 10 days or two weeks MAX.
Best of luck man! I know a strain u might like. Mine I made so thats out, but I can give u a a hint on one strain.