Original post, second pic, is that an incandescent in the middle there? Certainly looks like it to me, get it out of there, they are next to useless for growing plants and give off more heat than light.
Ideal light levels are between 7-10,000 lumens per sq ft, the sun provides around 10,000 lumens/sq ft on a clear day. 3000 is the bare minimum you can get away with but will not give great results. You have just shy of 7 sq ft, so you want between 48,000 and 70,000 lumens ideally.
A 150w hps is about 15,000 lumens, 250w is roughly 30,000, 400w about 50,000 and a good 600w will give you 90,000 (all depending on the quality of the bulb).
It depends how much you want to get out of this, as that will be proportional to what you put in. When you consider that the price difference between the different sizes is pretty minimal, and that the larger wattages tend to be more efficient, it seems more economical to get a big light, and I would say in your space the difference in coverage between one big and multiple light sources will be small. I'd recommend a 400 or a 600, but either will require good ventilation, 150-250cfm can fan as an exhaust, dependant on your intake temperatures.
There are plenty of perfectly good cfl grows, but it boils down to the fact that hps are up to twice as efficient as cfls on a lumens per watt basis, although cfl advocates point out that cfls can be kept closer to the plants, and can be more easily spread out around them, but cfl light will only penetrate at best, 6 inches away from the bulb, which is why it is essential to have them as close as possible to the plant. Comparitatively (did I make that word up?) hps can get through at least a couple of feet of canopy and still give reasonable results on the lower buds.
I think I've rabbited on for long enough now, hope this helped you make a decision.