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An incandescent light bulb has long been used to symbolize a bright idea. But in truth, energy-efficient CFL bulbs are a smarter choice for homeowners today.
In a straight comparison of fluorescent bulbs versus incandescent bulbs, CFLs are superior for many household uses. CFL bulbs use less energy to generate the same amount and quality of light. Less energy use means smaller electricity bills and pollution from coal-fired power plants.
These innovative light bulbs that save energy are slowly replacing their incandescent cousins. Due to changes in U.S. federal law (“The Energy Independence and Security Act of 2007”), new general service light bulbs must be 30% more energy efficient by 2014. CFL bulbs and low energy, mercury-free halogen lamps meet these more stringent requirements today.
Fluorescent Bulbs versus Incandescent Bulbs
The U.S. Department of Energy estimates that lighting a single 100-watt incandescent bulb for three years costs $39.54, while the total three year cost of an equivalent 23-watt compact fluorescent is just $19.06. When you consider the number of light bulbs in the typical home, the potential for energy cost savings is tremendous. The lifespan of fluorescent bulbs versus incandescent bulbs is also greater, typically 10 times longer.
So, fluorescent bulbs (versus incandescent bulbs) cost much less to use, reduce harmful emissions to a greater extent and last longer. The light quality cast by the best ones cast is very comparable. But are they flawless? No. CFL bulbs take a minute or two to reach maximum light output. Lighting them for less than 15 minutes at a time or using them in totally enclosed fixtures shortens their life. Not all can be used with dimmer or 3-way switches. And it takes mercury to make them work.
The Bottom Line: Match Bulb Type with Lighting Needs
Consider these scenarios:
| Scenario | Lighting Need | Best Bulb | ||
| 1 | Bright, directed light for exterior fixture from dusk to dawn | 100 watt equivalent CFL spotlight rated for use in wet locations | ||
| 2 | Recessed downlights controlled by a dimmer switch in a busy family kitchen | 60-70 watt equivalent dimmable CFL reflectors with a compatible dimmer switch | ||
| 3 | Bright, instant light for closets rarely lit for extended periods | High wattage incandescent1 | ||
| 4 | Bright, directed light for a frequently used desk or task lamp | 75-100 watt equivalent spiral CFL in “daylight” color | ||
| 5 | Low level ambient light in decorative fixtures in a half-bath | Low wattage incandescent flame-tip or similar1 | ||
| 1Consider low energy, mercury-free halogens for modest efficiency gains vs. traditional incandescents. | ||||
To learn more, read how CFL bulbs positively impact your utility bill or discover more benefits of using fluorescent bulbs versus incandescent bulbs. To see our energy efficient bulb recommendations for your fixtures, try our Bulb Finder.