Well the strain I am going to grow is super chron so I dont really know how tall it gets. I got my idea from the indoor high yield guide by Ed Rosenthal. Theres a picture in there of a guy who has ak clones with single colas that are less than a foot tall but has them 5 per sq. foot. Also, I will be adding around 105 watts of flouros in there today so i hope that will be enough light.