Just make sure u flower when the plants are about 12inchs, u dont want them to get to tall, as mentioned u need to figure out where the base of the plants is and how much vertical room u will have with the light, take into consderation u will need a bout 6" of canopy clearance with a air cooled 1k to be on the safe side and have even distribution of light. So u should have about 4 ft of actual grow space, but its dependent on what u use in the tent of course. 4x4 is a pretty decent grow area, thats 12sqft each plant gets 2sqft which is plenty. If u can try and grow a hybrid, 50/50 sativa/indica, this way u wont grow to high, yet u will get some good bush growth too, but not to much of either. Its up to u tho, u can make almost anything work with that kinda set up.