Yeah if you want to grow a bulk of weed then the only proper equipment would be a hps. It will cost as much or less then setting up all of those cfls, you will have way more light to work with, and it will be done with less energy over all.
If someone can pull a lb off of four cfls I would be very impressed.
LST or not cfls don't have enough efficiency to be worth it for big grows. And if you wait the plants might get to big for the ammount of light and not beable to put up buds and only support their already growing photosynthetic material.