as stated above, good lights make for good yeilds. longer veg means more nodes which means more bud sites which means higher yeild.

if you want to maximize space and yeild, i suggest looking into dwc; you could pull a half lb per plant.

and, you can find a 400w hps raw ballast assembly for about a hundred bucks. well worth it.

remember; your plants will veg, even under 12-12, until they are sexually mature. forcing early can cause stretch problems, but with flouro grows, it's pretty much standard to flower way to early.

maturity comes anywhere from 4-12 weeks