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Let There Be (Fluorescent) LightFebruary 2008Read this issue of Greentips onlineA provision in the 2007 energy bill requires lightbulbs to be 30percent more energy-efficient starting in 2012—a standard that willeffectively phase out traditional incandescent bulbs. But why wait?Today's compact fluorescent light bulbs (CFLs) already use 50 to 80percent less energy than incandescent bulbs. If every U.S. householdreplaced just one incandescent bulb with a CFL, the EnvironmentalProtection Agency estimates we would reduce global warming pollutionby an amount equivalent to taking more than 800,000 cars off the road.Most CFLs on the market today offer the same performance, versatility,and light output as incandescent bulbs. Look for the following productinformation to ensure you find the right bulb for your needs:Whiteness: Like incandescent bulbs, CFLs can produce light in manyshades of white. Color temperature (or the perceived "warmth" of thelight) is measured in kelvins (K); the lower the color temperature,the warmer the color. These temperatures range from about 2700 K (a"warm" yellow-white) to 5000 K (a "cool" blue-white). If thetemperature is not listed, look for the terms "warm white" and "coolwhite" (or "daylight").Brightness: Because CFLs use less energy (as measured in watts) toproduce the same amount of light as an incandescent bulb, look forlumens (a measure of light output) on the product label to find CFLsthat will match or exceed the brightness of the incandescent bulbs youhave been using. For example, a 60-watt incandescent bulb and a15-watt CFL each produce about 800 lumens. The Energy Star website(see the related links) lists the lumens produced by commonincandescent wattages, and CFL packages often mention the equivalentincandescent wattage as well.Compatibility: CFLs are available in a wide variety of shapes andsizes, for both standard and smaller (candelabra) sockets. There areeven CFLs designed to accommodate three-way, dimmable, motion-sensor,and outdoor fixtures.CFLs last up to 10 times as long as incandescent bulbs, but becausefrequent on/off cycles can reduce their useful life, target high-usageareas of your home first (that is, where lights stay on for longperiods of time). This will ensure you get the most energy savingsright away.CFLs and MercuryCFLs do contain a small amount of mercury, so they cannot be thrownout in the trash (see the related links for disposal information).However, the mercury in CFLs represents a much less significantenvironmental hazard than incandescent bulbs because CFLs require muchless electricity, and more than half of our nation's electricity isgenerated by coal-fired power plants—the largest U.S. source ofmercury emissions.In other words, the average coal-fired power plant emits only 3.2milligrams of mercury for each CFL running six hours per day for fiveyears, but emits nearly 15 milligrams of mercury for an incandescentbulb running the same amount of time, according to UCS research. Thedifference far exceeds the approximately five milligrams presentinside a CFL. Properly disposing of CFLs ensures the mercury in themremains contained.Related LinksEnergy Star—CFLsEarthEasyNational Electrical Manufacturers Association—CFL DisposalWant to have a bigger impact on environmental issues? Add your voiceto more than 170,000 online activists.Help us develop practical solutions to environmental problems byjoining UCS or making a donation today.Subscribe to this free monthly newsletter or read past issues in theGreentips section of the UCS website.Visit the web address below to tell your friends about this. Tell-a-friend!If you received this message from a friend, you can sign up for theUnion of Concerned Scientists.To ensure you continue to receive emails from UCS, be sure to addgreentips@ucsusa.org to your address bookWe are committed to protecting your privacy, so your email addresswill NEVER be sold or exchanged. |