I'm in agreement with g0nz0. I have 3 42watt cfls grouped together over the tops of each of my plants, and I can see the difference. My nodes are now only 1/2" apart at most where before I had a lot of stretchin. I also have some 23watters down alongside of my plants for the undergrowth and it's really bushing out. It's a pain in the rump adjusting all my lights twice a day, which is why I've ordered a 400watt hps setup and mh conversion for my next grow.