There are several people using CFLs d7reu, they won't be the biggest plants but with a little planning and care you should have some good personal stash. Have a look around the forum for cfl grows and that should give you some idea of what to expect. Like Nam said, the more lights the better your grow will be but it is about economics as well. Use what you have and invest in more when you have the spare funds. The more lights you have the bigger yield you can expect. Best of luck brother.