The hps route is definately the better in terms of yeild per watt and probably potency, but theres plenty of people more than happy with the results they get using cfls. Have a look around and see how much a hps setup will cost, you'd only need a 250watt light for your space, but then you'd need a powerful fan to exhaust the heat and a cooltube too as you've not got a lot of height to play with so you can't afford to have your lights 18" away. I'd say go with the cfls for now, and when you've got a grow or two under your belt you can decide whether you wanna invest in the hps setup.
hudson88 Reviewed by hudson88 on . Mega HO CFL http://www.bltdirect.com/product.php?pid=235&cat= http://www.bltdirect.com/product.php?pid=266&cat= 65 Watt is equal to a 325 Watt 85 Watt is equal to a 425 Watt Good prices, 240v only. Rating: 5