Is there a problem using cfl bulbs on certain switch timers? If so, what is the problem? I have noticed that some timers states to use on regular light bulbs(incandescent) only.

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Originally Posted by jrt

If so, what is the problem?

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The problem is the effects of the interaction of the CFL electronics and the timer electronics when the two are placed in a circuit together. Solid state timer switch kills CFLs discusses the effects of timers of triac design. Some mechanical timers or solid state relay type timers (example: Swylite) are compatible with CFLs.

You need to use dimmable CFL's.