i believe you are both right i just feel that DFG is saying that you can still use twhat you have but it's better if you get more of them to increase your light area. you want to make sure all leaves are at the ability to perform photsysthesis. One light will only cover the top of the plant and not extend to the rest of the leaves, PERFERBLY you would want a better light source like HPS,LPS, or MH bulbs which require more power and create more heat and obviously more expensive. I chose a CFL system because i'm poor and i am only dealing with a few plants, limited space, and i'm a new grower. Maybe later i'll get something better