Used a rough guide is 1g per watt from good gardening, light is the limiting factor if you can grow a healthy plant.
If you're going to spread the light spread the crop, tie it over to flower, the full plant is bathed with intense light not just the top 1/3rd of the plant.
I forgot to add my last crop was chucked in and flowered I didn't have time to maximise it for 5 plants 318 grams of bud, just over 2 oz per plant average.