Howdy t3chyo, I would recommend you go the route of two 400 - 600 watt lights to spread the light around unlsess you go with one that moves around. If it was me I'd go with two 400 watt systems that will do both kinds of bulbs. Or you could go the way I did. Two 400 watt hps and 2,000 watts of CFL bulbs which only pull 520 watts. I don't know if I'm using more than I have to - I'm even running one 175 watt mercury vapor lamp. All I know is I didn't get these results when I did it with 2 - 400 hps and 1 - 175 watt mercury vapor. Check out my grow space at: http://boards.cannabis.com/showthrea...ght=lady+vapor
I'm so glad I have this summer to enlarge from 5X9 foot to 8X9 foot as I've found the CFL bulbs work real well with the hps. I'm glad I went with the CFL additions as the cost of electric is at least 150 dollars a month to run this way. Looks like you're in for some fun!