Well I'm not an expert on lighting but I can tell you what I have run in to and what I am running.

1) 2x3x6 cabinet. E&F setup, 400w cooltube, MH for veg and HPS for flower. # of plants 2
2) 4x4x7 grow tent. DWC, 400w cooltube, MH for veg and HPS flower. # of plants 4
3) 7.5x11x6.5 grow room :jointsmile:. Ebb and Grow system. 2 600w with only HPS atm. Veg is done under 4 4' floro's running daytime bulbs on 24/7. running 18 buckets atm but will end up with 21 leaving room to move.

I dont worry about growing allot of plants, I just try to get the most out of what I grow. Latewood's Legacy at top of page is a very good read, long but has good info.
Depending on how big you want to grow these things, if it was in my house I would most likely do 3 tubs with 2 plants per tub. 2 250w lamps with side light until can afford to upgrade to twin 400w. Would also suggest lollipoping the plants as this will help concentrate on bud growing and get rid of the scraggly looking shit at the bottom of plant.
Hope this helps, time for work