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More on CFLS and Dimmer Switches.

3. Can I use a compact fluorescent light bulb with a dimmer switch?

To use a compact fluorescent bulb on a dimmer switch, you must buy a bulb that's specifically made to work with dimmers (check the package). GE makes a dimming compact fluorescent light bulb (called the GE Longlife Plus Soft White Energy Saving Bulb) that is specially designed for use with dimming switches. We don't recommend using regular compact fluorescent bulbs with dimming switches, since this can shorten bulb life. (Using a regular compact fluorescent bulb with a dimmer will also nullify the bulb's warranty.)

http://www.gelighting.com/na/business_lighting/faqs/cfl.htm#3

Here are more FAQs on CFLs that I cut and paste from GE's site (most likely a very trusted source!)

1. Can I use a compact fluorescent light bulb with an electronic timer or photocell (AKA electric eye)?

2. Can I use a compact fluorescent light bulb in an enclosed light fixture?

3. Can I use a compact fluorescent light bulb with a dimmer switch?

4. Can I use a CFL in applications where I will be turning the lights on/off frequently?

5. Can I use a CFL in applications involving vibration such as a ceiling fan or garage door opener?

6. What should I do if I break a CFL bulb?

7. Why does the color of CFLs seem different at start-up?

8. Do light bulbs (such as fluorescent and compact fluorescent bulbs) give off hazardous amounts of ultraviolet (UV) light?

9. How does a compact fluorescent light bulb work?

10. What compact fluorescent light bulb do I buy to replace a 60-, 75-, 100- or 150-watt regular bulb?

11. How much heat (or infrared radiation) is emitted by regular, halogen, and compact fluorescent light bulbs?

12. What is Energy Star® and why are many compact fluorescent light bulbs Energy Star labeled?