That's entirely your call.
I'm just a bit infatuated with these new LED bulbs, (which are about 9 to 12 watts) you can get spiral CFL's in a wider choice of kelvin color and brightness and they tend to be cheaper. I recommended a limit on the CFL's maximum wattage, as the ones above 22 watts tend to run a bit warm in these reflectors.
This was an experiment that seems to be working well for my tanks. The clamp-on lamp fixture I have has a pretty good focus and spread for either bulb, it spreads the light in a wider, less focused pattern, since I also plan to use my HOB filters for immersed plants the lights sit a few inches above the tank's rim.