There are too many factors to consider before anyone can estimate just how much your plants will yield. Here are just a few. Are you growing in soil or going the hydro route? Is that just one 200w cfl that stays in the same place from sprout to harvest or a number of cfls that total 200w that you can place all around your plants. Some growers move their lights several times a week and their yields are greater for it. Ps: i feel you should know that I've never grown indoors before and everything i have said here is from what i have read in preparation for my own upcoming hydro grow. I'm doing an eight 5gallon dwc grow using two 200w cfl lights one 6500k and one 2700k. Still haven't picked what nutes i will be using