CFL's are really not ideal, also a single larger CFL is better than multiple smaller CFL's.
If height is not an issue, then I would seriously suggest you consider other options of lighting. CFL will suffice and you can grow cannabis with it but I do not think the struggle and money spent is worth the effort and time invested as your yield will suffer for sure.
I'd suggest you look into other lighting options, be it LED or even a cheap HID setup. Depending on how long term you want to do this for, forking out the money upfront for decent LED lights which are a lot more energy efficient is well worth it. Also you can veg and flower under the same spectrum.
Otherwise if you dislike LED for whatever reason, forking out the money for an HID setup will far out perform any CFL setup you could rig up for the same amount of money.
CFL is fine for clones and seedlings, I would prefer to stop using CFL once the plants get bigger.
My 2c