Just get a Linear tube lamp. Unless your cage is small, I wouldn't bother with CFL. I use the same size 6500K lamp as my UVB and use dual lamp fixtures so they are side by side. It is enough light to keep your plants happy. But you will need more lighting if you try to keep plants that need lots of light. For ficus, pothos and scheflera, a 24" or 48" linear 6500K lamp will do just fine.