CFL's are compact fluorescents, they are the energy saving bulbs, some screw directly into lamps, others need a ballast.
Click this link and read it if you plan on growing with cfl,s. Just gives you general knowledge of the bulb
Im growing 3 plants right now using 6 CFL's buts thats only because ive just finished school and dropped out of college so i have no cash right now, a friend that owes me gets 5 finger discount at most shops so thats how i got these..
I plan on getting about 20....should be about 40k-70k lumens
I aimed to get 50k lumens so anything above that i am happy with.
read more about cfl growing for more details, like you need daylights for vegging ect...
Read that link i gave you for a lil more info on cfl's then do abit more research on growing with cfl's.
Im so baked right now i didnt even realise this was your thread lol, i thought i was answering someone else!
Ignore all the times i said ' if your planning on growing with cfl's '
i think i said it more than once