I'd go with flouro tubes. They will provide much more lighting then CFL's will, also too you can place them against the wall for bank lighting. I used a total of 6 4ft double tube fixtures, 12 lights in total. Here's a pic to give you an idea of what you could do eith 2ft of space. I used 4x2ft. Your buds will never get as big as HPS lights, but the trich production kicks in earlier, and produces up to 30% more over HPS lights. I used a ratio of 7 5000K, 3 3000K, and 2 6500K for side lighting. At flowering the side lighting was switched to 1 5000k and 1 3000K. I used regular T8 tubes, just make sure the fixture is T8 compliant...most are but some are made for T12's, and the T8 bulbs will run hotter and burn out faster.