[Dport]

The whole idea is to keep the plants super short and pack as many as you can under your lamp to increase yield.
I have a hard time pulling a 1/2 lb. off of a pretty good sized plant grown outdoors. Unless you want an eight foot monster with fluffy buds along the bottom you might want to scale back a bit.
Try 12 clones in veg room while 12 are flowering.

edit: plants can more than double in size after you put them into flowering. Those 4-7 footers are going to need 12-14 ft. ceilings.