i've been using cfl's for about 2 years, micro grows, which fit my needs pretty nicely
volume is the cfl's enemy, a big space is not cfl friendly
get a cfl close to the bud, and it is a good dense bud
i use a diy grow chamber that's 1.2 sqft for area, about 3 feet tall, 78w of cfl in flower
buds...