Compact fluorescent light (CFL) bulbs save money on your electric bill by using about 75% less energy than incandescent bulbs. CFL bulbs also last up to 10 times longer. However, CFLs have different light characteristics than traditional bulbs. Here are a few tips on how best to use them in your light fixtures.
Benefits of CFL Bulbs
Compared to traditional incandescent bulbs, CFL bulbs offer several benefits. Among them:
- CFL bulbs 8se about 75% less energy. A 15-watt CFL produces the same amount of light as a 60-watt incandescent bulb, saving you $30 or more over the bulb’s life.
- They last up to 10 times longer. CFLs usually last between 6,000 to 15,000 hours compared to 1,000 hours for incandescents, reducing replacement costs.
- Produce 90% less heat.
Light Quality Differences
While efficient, CFLs have some light quality differences from incandescents:
- Color temperature refers to the tone of the light, from warm shades mimicking incandescents to cooler blue-white tones. Choose bulbs based on your preferred tone.
- CFLs reach full brightness about one to three minutes after being turned on.
- Not all CFLs work with dimmer switches. Check the packaging to ensure dimmable capability.
- CFLs and LEDs do not radiate outward like incandescents, so they may not work as well in your fixtures designed to focus light directionally.
Using CFLs in Enclosed Fixtures
Enclosed fixtures surround the bulb and block airflow. Examples include recessed can lights and covered vanity fixtures.
Don’t use CFL bulbs in enclosed fixtures that block airflow and cause excessive heat buildup that shortens bulb life. Fixtures with ventilation or light-transmitting panels are better choices for CFLs.
Three-Way Light Sockets
Three-way sockets let you toggle between light levels by switching between filaments. CFLs typically only work in a one-socket setting because they have only one filament. You must have a CFL made specifically for three-way sockets for adjustable light.
Dimmable CFL Bulbs
For fixtures you want to dim, choose CFLs labeled specifically as dimmable. They contain circuitry to respond to voltage changes for use with your dimmer switches. Test new bulbs with your dimmer to ensure proper functioning before completing the installation. You may experience some buzzing on some controls. If disruptive, try another dimmable brand.
Spotlight and Floodlight Fixtures
Some recessed spotlights are unsuitable for CFLs because of an enclosed design that concentrates the light. Check manufacturer guidelines before using CFL spotlights. For floodlights, choose flood-specific CFL bulbs designed to distribute light widely. Standard CFLs focus light directionally and may not provide sufficient flood coverage.
Vibration Resistance
CFLs’ electronic components can be sensitive to vibration, so fixtures in vibrating environments like workshops may shorten the CFL life span. For these locations, opt for vibration-resistant CFL bulbs.
Cold Weather Use
CFLs do not work as well in cold temperatures. You will get dimmer light until a CFL warms up. Choose CFLs made for cold weather with improved low-temperature operation for outdoor or cold use.
So, Are CFL Bulbs a Good Choice?
While offering energy savings and environmental benefits over incandescent, CFLs have some limitations in light quality and fixture compatibility to consider. But with the range of shapes, sizes, and features available today, CFLs work well in most general lighting uses when matched to your fixture needs.
FAQs About CFL Bulbs
Do CFLs contain mercury?
CFLs contain a small amount of mercury. The mercury is sealed and poses no hazard when used properly. However, you should treat worn or broken CFLs as hazardous waste, not household trash. Many retailers will recycle CFLs for you for free.
Can CFL bulbs be used outdoors?
You can use CFL bulbs outdoors, but you must buy bulbs rated for outdoor use that can withstand temperature extremes and wetness. Packaging should clearly state if the bulb is for indoor or outdoor use.
How long do CFL bulbs last?
With regular use (three hours per day), CFL bulbs last five to 10 years. They have rated lifespans of between 6,000 to 15,000 hours. Factors like temperature extremes, vibration, and on/off cycling affect life span.
Is the light from CFLs safe?
CFLs must pass extensive safety testing on emissions before a retailer can sell them. When appropriately used per ratings, CFLs pose no known risks to humans or animals.
Can CFL bulbs touch insulation?
Although CFLs produce much less heat than incandescent bulbs, they require a 3-inch clearance from insulation and combustibles in your home.
