Quote Originally Posted by Volker
Yes. It can all be done w/CFLs. And done nicely; CFLs allow you bring the lights "up close & personal".

Keep in mind that CFLs work best in small spaces - like speaker cabinets, closets, garbage cans, etc. In an actual grow room, you're better off using HPS overhead with CFL sidelights.

Spectra of CFL & HPS are slightly different. CFL is ~2700K and HPS is ~2200K. Both produce the frequencies needed for bud production. Plants grown under CFL exclusively can sometimes show a "PAR defficiency", because certain frequencies are missing. This usually shows as "pinkness" in the pistils closest to the bulbs, is not harmful* to the plant, and is very pretty.

*Because the plant is an annual, not a perrenial, it doesn't matter if it gets "light rickets" the day before you kill it.

Dont get me wrong, I am no noob, I've just never flowered with a cfl.