Not much experience with soil. But the 3Little Birds sure do. They use, or at least use to use a system in which they would rotate 12 different containers through a 3 600w setup. The plants closest to harvest were in the middle of the area, the plants just started flowering and in the mid-stages were on either side of that area. Everyday a plant is either rotated or moved to the "station" closer to the middle. They used all organic nutrients, not organic based, and they used to pull the equivalent of 3LB per 1k light, but using 600's. Not a bad example to copy. I know I have that journal, but see if you can find it. if not hit me up, i should still have it.