i use a 600 watt for 5 plants max so maybe x 2 for u or one 1000 watt hps but then u av got to deal with the heat extraction etc, i heard somewhere if all is grown under optimal conditions it was a gram per wat so 600 watts = 600 grames
and for 200 dollars u will b in the ball park for a 100 watt hps lamp and ballast no probs!! good look to ya man, hope it goes well for ya peace !