There right you will harvest according to your light, nutes, add ons and such. It is different each time for every one except the most advanced growers. I have room for 12 . 6 at a time. 1000 HPS and I hope to get 6 to 12 oz's a month SOG, small. Short and fat is what you want or scrog. Light cannot get through a canopy, Anything over a foot is wasted.