^ im running under a similar situation. U can use one 42 watt per plant for the whole operation. I have seen it done with a 23 watter. (micro grows we are talking.) I would grow 2 plants to reduce the risk of getting male... but here is my set up:
2 towels nailed up to cover top and front.
then i push a couple shirts in front of that.
the box:
1 42 watt cfl
2 fans pushing air onto it
a hole in the side of the box to push air out (will eventually
have another fan sucking air out)
growing a few plants, when they get larger i will pick the 2
best looking and give the others away. and will get a y splitter
and another 42 watt... maybe a new socket.
the box measures: HxDxW (20")Hx(14")Dx(17.5")w
Oh and i rotate the plants 2-3 times a day (when i look at them) so they dont grow at an angle