You know, I have seen great grows done with CFL's from veg to flowering without even changing bulbs. I grew my first 4 bagseed plants and got nearly a 1/4 pound off the 4, I was using three garage shoplights with daytime bulbs X6 actual LONG bulbs. That was my first grow. I since then have bought a 1,000watt HPS and am on my second grow with it. A great light and only runs 20-50 dollars a month on 220V 5amps. I was lucky and found on nearly new for $200.00
Just keep those cfl's VERY CLOSE until flowering.
4 plants my 6cfls = 1 ounce per plant
1 1,000watthps = 2-4ounces per plant