Quote Originally Posted by Dutch Masta
Dont know whats wrong with the people that responded so far, but 1) you can even look around, plenty of people grow with CFLs. The size is a bit smaller, but thats usually a good thing since space is often an issue. Instead of growing one or two large plants, you may want to grow a few smaller plants. 2) that is the correct light spectrum.. but when flowering time comes you will have to buy new bulbs, no biggie they are 6$ for 2 at wallmart.
I'm all for CFL grows. In fact, I'm going to be growin with a HOT5 (High Output T5 fluorescent) soon. It factors in at around 20000 Lumens. In a rectangle "cabinet/closet" area thats roughly 1.5ft x 4ft x (adjustable hieght). The adjustable hieght plays a big roll in penetration.

CFLs can and will do well, as long as you can supplement correctly.