so i don't need foot tall clones to have a deicent tree after veg for 4 to 6 weeks? my setup specs are..

about 6m x 3m 3 600w high output hps (1 per plant) in rockwool i have 2 pumps, 1 is for flow, and other is watering, (every 4 hrs for 20min) and an aquarium pump with 2 airstone balls i am using nutrients packaged by my hidroponics shop. i have had no probs i guess.... except that i put the clones in before they had any branches, and only had a gap of 30cm from each light to the plant top. (i thought that hps was like mh) now i have rooted 5 cuttings and wan't to turn them into monstors for next harvest and i have a few from seed but in australia the seeds gettin around are ussually shit