There is no reason you can't carry on using CFL's.I'm growing with them myself and my plants aren't autos.Just change to a different spectrum bulb when you want to put your plants into flower.Modern CFL's,specifically designed for each stage of growth are cheaper to run and every bit as effective as any other type of bulb.
Try here for info and specifics.
www.tradehydro.com I don't know where you are so I don't know if shipping costs would be a problem,but I hope it's useful to you.
Cheers,Tumnus.