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CFLs available for 3-way switches, recessed fixtures
 Energy- and money-saving compact fluorescent light bulbs (CFLs) are available in a number of styles. If you're replacing a bulb that's operating on a dimmer or three-way switch, then look for a compact fluorescent light bulb (CFL) made for this use - otherwise, the CFL will not perform as well nor last as long as it should.
If you're replacing a bulb in a recessed fixture in your ceiling (also called "recessed can"), select an Energy Star-qualified reflector CFL for this purpose. Note that reflector CFLs may take longer to warm up than a regular CFL, but they will offer bright light and perform better in your recessed fixture. Choose a bulb that offers the same lumen rating (amount of light) as the light you are replacing.
Select the color that works best for you.
Warmer colors (2700 to 3000 Kelvin) are appropriate for most rooms, but a cooler color (3500 to 6500 Kelvin) may be preferable for task lighting. Cooler color tones are generally referred to as "bright white," "natural," or "daylight."
Replace bulbs where lights are typically left on the longest for maximum energy savings.
Remember to dispose of your CFL responsibly when it burns out, so the small amount of mercury in it may be reclaimed. Whatever style CFL you choose, make sure it has qualified to meet the Energy Star standards. Energy Star is the federal Department of Energy's efficiency rating for appliances, electronics and homes.
Source: energystar.gov
Related Links
EPA.gov clean-up and disposal recommendations for CFLs 
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