CFL's dont cost alot, but the money is spent in buying shit to screw them into, even if you go the route of plugging somethng like this
http://www.amazon.com/Leviton-61-Polarized-Outlet---Lampholder/dp/B001OM1L06/ref=sr_1_1?ie=UTF8&qid=1409076275&sr=8-1&keywords=plug+in+light+bulb+outlet
into a bunch of surge strips....still going to get costly after a bit. And its also really not that safe. if you think, a surge strip os about 6 bucks and then 3x the outlets is 2 bucks each...your looking at 12 bucks (not including bulbs) per rig. if youu get the 23w CFL and not them shitty 13w ones your looking at around 2 bucks a bulb...so for the sake of convorsation we will say 18 bucks per rig bulbs and all.
now prob 2 rigs per plant that is 6 total 18x6= 108 bucks!!
now your running 3 bulbs in each rig and 6 rigs @ 23w per rig so 3x6 = 18 x 23w = 414w....so now your running more electricity than a 400w HPS so your light bill charges will be more....
and lets not forget heat, CFL's dont have a cooled hood, so your stuch extracting the upper most part of the closet (heat rises) to try and remove the heat...usually dosent work out that well...
and on top of that even with 414w of CFL your lighting is still going to be weak...
do yourself a favor, if your going to grow, skimp on everything else but your medium and lights.
3 year warranty on the apolloi ballasts, also dimmable so you can run it at 50% (200w) untill the plants get a little bigger to save yourself some money on electric..
dont have the money this week? put that money you were going to dump into CFL's aside and save up, they wil be fine for a week or 2 under your current lights as long as you keep them close so they dont stretch, when they stretch too much they just fall over and die...