What to Look For

Although there are other options, including LEDs and halogen bulbs, when it comes to cost, availability and savings compact fluorescent bulbs (CFLs) currently offer your best value for lighting.

Lumen Output: To maximize energy savings, choose the product that provides the most lumens at the lowest wattage. Energy Star lists common lumen equivalencies for CFL and incandescent wattages.

Shape:

• Triple-tube bulbs provides high light output in small spaces, ideal for desk and reading lamps.
• Flood lamp CFLs work well for recessed and track lighting.
• Globe shapes work well in bathrooms and above vanity mirrors where aesthetics are important.
• Torpedo-shaped candelabra bulbs fit nicely in small light fixtures such as sconces and designer lamps.
• Dome-shaped CFLs, similar in look to conventional incandescents, are a better fit for lamps whose shades clip onto the bulb.

Kelvins: A CFL’s color is indicated by the Kelvin (k) temperature (listed on the package). Higher Kelvins, 5000k or 6000k, correspond with cooler, bluer colors, while lower Kelvins, 2700k or 3000k, give off a warm, cozy glow similar to incandescents. If the package doesn’t list the Kelvin temperature, look for descriptive phrases like “warm white” and “soft white.”

Energy Star rated: Energy Star CFLs use 75 percent less energy than standard incandescent bulbs.

Shopping Tips

• CFL brightness decreases over time, but higher-watt CFLs maintain a higher lumen output for a longer period of time.

• To provide sharp contrast in workspaces and under reading lamps, buy a CFL labeled “daylight,” or with a higher Kelvin temperature.

• Repeatedly turning CFLs on and off shortens their lifespan: Install CFLs in fixtures or rooms you keep lit for more than 15 minutes at a time.

• Because CFLs contain a small amount of mercury, call your sanitation department or visit www.earth911.org to find out the best way to dispose of bulbs in your area. For tips on cleaning up a broken CFL, see "Concerned About Quicksilver."