Cfl Point System
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You can replace a 100-watt incandescent bulb with a 22-watt CFL and get the same amount of light. CFLs use 50- to 80-percent less energy than incandescent lights. While initially they cost more, CFLs are less expensive in the long run because they last much longer than incandescent bulbs.
How Do CFLs Work?
CFLs produce light differently than incandescent bulbs. In an incandescent, electric current runs through a wire filament and heats the filament until it starts to glow. In a CFL, an electric current is driven through a tube containing argon and a small amount of mercury vapor. This generates invisible ultraviolet light that excites a fluorescent coating (called phosphor) on the inside of the tube, which then emits visible light.
CFLs need a little more energy when they are first turned on, but once the electricity starts moving, CFLs use about 70% less energy than incandescent bulbs. A CFL’s ballast helps 'kick start' the CFL and then regulates the current once the electricity starts flowing.
This entire process typically takes 30 seconds to 3 minutes to complete, which is why CFLs take longer than other lights to become fully lit. CFLs with decorative covers like globe or reflector shapes have a unique design challenge that results in the tradeoff of a slower warm up time, which is why these CFLs take longer than bare spirals to reach full brightness.
Cfl Point System
Older CFLs used large and heavy magnetic ballasts that caused a buzzing noise in some bulbs. Most CFLs today — and all ENERGY STAR certified CFLs — use electronic ballasts, which do not buzz or hum.
Cfl Point Systems
Cfl Scoring System 1 Point
Purchasing Tips
- Look for the ENERGY STAR label
- Learn more about why to choose ENERGY STAR.
- Decide how much light you need
- Remember that Lumens measure brightness, not Watts
- Learn more about brightness.
- Check the package for the bulb’s recommended use
- New bulbs are specially designed for certain applications, let the package be your guide!
- Think about the mood you want from your light
- Choose a light color from warm to cool for your needs.
- Learn more about color and mood.
Check out the ENERGY STAR Light Bulb Purchasing Guide (PDF, 1.49 MB)