i got a 22"x40" space i was wondering what would be a good height to make it? im splitting the 40in in half for veg flower. im using a 600w hps for flower with an air coolable reflector (also do i still need ventilation system if i use a cool light?) and flourescent for veg, prolly cfls since 2 ft is the smallest tube lights i think. using 14 gal res for both with the veg having 7 sites and flower having 5 so i can accomodate a mother, sound good? any comments? objections? anything will help. thanx guys!