Is there any ventilation in that box? You need a fan to exhaust stale air and draw fresh in.
You don't need a reflector, but it does save wasting half the light coming off those bulbs. As well, 1 cfl per plant will be ok for a while, but you'll need to add more as they grow, probably wanna end up with 3-4 42w per plant, or just get a 150w hps and be done with it.
What strains you got? Any plans for them once they get a bit bigger? Topping, training and what have you?