I've always looked at CFL's as a supplemental light source for those hard-to-get to places in a grow room. If you're considering a boat-load of CFL's to grow a plant.....spend just a little more money and at least get yourself a T5 HO set-up. CFL's are hot, are really not all that efficient when comparing usable wattage, and soooo many people on here have burnt the shit out of their plants using them.
T5 florescent lighting is relatively much cooler, offers a better light spread, gets more wattage to where you want it, and if you mix your bulbs correctly will give you a superior plant.....arguably better than HID's or LED's.....NOTE: I said arguably.
If you're on a tight budget, check out Craigslist for a used fixture and bulbs. I got my 4' four-bulb fixture with four good bulbs for $45. Home Depot online has very good T5 fixtures including bulbs and free shipping (in plain brown box) in just about every configuration available. I bought a 2' four-bulb rig for $95 and currently have two 2' plants happily vegging under it.
Here's Home Depot's 4' four-bulb rig with bulbs included:
http://www.homedepot.com/p/ViaVolt-4-ft-4-Bulb-T5-High-Output-Copper-Fluorescent-Grow-Light-Fixture-V44/203012866