If you are going to use cfls you can defiantly get a great yield. But you have to remember, put your lights up close to the plants, and I mean where they are nearly touching them. Mine actually touch the plants, and yes my plants do get tiny burns once a while at the tips of the fan leafs, but these fan leaves will be needed to be sacrificed in order for me to get anything worth writing home about. The closer the better. At 3 weeks some of mine where OVER a foot (I say 14 inches) and that's from seed, not a clone. While its true that the genetics and grow method may vary your success, they look very healthy but they sure should be bigger by now. Try it and show us what happens with some more pics in a week. Happy growing!