The light is what gives you the bud, not the number of plants. You could have 9 big plants under a 1000 or 16 medium or even 24 small, it don't matter. You'll still get 1-2 lbs per light. The number of plants don't matter. I consistantly hit 2.25 or better for every 1000 watt light I use but I'm high tech; CO2, auto feeding, etc. If you want more, buy more equip.