A 23 - 26 watt spiral CFL is equivalent to the 100 watt bulbs you are using now.
40 watt CFL's will give you almost twice the light you have now, and it will be closer to the proper spectrum for growing.
You should use bluer light (>5000k) for veging, and redder light (2000-3000K) for flowering.

AND you're still going to need ventilation, or you'll burn up your plants.