i used cfls when i started my first grow, they got me well into flower, now i use a 400 watt hps as i was using that many watts with the cfls as i had about 15 of them, now my hps i dual spectrum but when i start plants under it they stretch like crazy, so now ive got a small cupboard where i start my seedlings and clones, in here i use a couple of cfls, i keep my plants under these for a couple of weeks, the cfls prevent any stretch and keep node spacing very close, growth is slightly slower but the plants wont stretch under cfls,
plus if you put your hand under the cfl bulb so its touching the bulb then slowly move your hand away, you will notice that after about 2 inches the light level drops off very quick, so i kept my plants within an inch of the lights, plus id say you need 4 23 or 30 watt cfls per plant, i used a mixture of both 6400k and 2700k, but for veg i used a ratio of 2/1 so i used 2 x 6400 k to 1 2700k cfls, then i did it the other way round for flower, 2 x 2700k and 1 6400k, the more bulbs you can use the better, just watch heat build up at plant level, make sure you have a small fan blowing, but dont have it blowing directly at young plants as it will make them dry up and die, i had the fan blowing above the lights to remove the build up of heat,
feel free to ask any questions and ill do my best to answer, or check out my journal in the link below and you will see i used cfls right up till flower