You would benefit much more from 40 watt fl's In my veg room I use four foot Fl,s with 40w cool whites. I don't think 20w fl's are going to cut it (I could be wrong)You could also pick up some of them cheap (7-8$) clip on fixtures and add a couple 100+ CFL's. and keep the lights like 2-3 inches from the tip of the plant, the are quite streched out the CFL's are a run a little warmer but that didn't cause any problems for me. That Oughta make them nice and bushy.