Starting the plants will be fine under the two lights. Keep the heat away so they don't dry out. You'll need more light to flower. whether it is cfl's or hps. Both lights have positives and negatives. you just have to be able to deal with the effects, heat, distance, and so on. CFL's are easy to sidelight or even surround a plant with. The heat of a hid limits it to more traditional top lighting. Hid's penetrate the foliage better. Bottom line if I remember correctly you need something like 6000 lumens to flower for a minimum. HID's make it easy and surpass that with ease. CFL's well it take's a few but is easily possible.