GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY
Energy Star logo on the compact fluorescent light bulb package. Household compact fluorescent light bulbs (CFL) with the E26 Edison screw base that fits into existing light fixtures have become increasingly popular in recent years. Compared to incandescent light bulbs, CFLs are generally several times more efficient and have a longer life. Despite the improved efficiency, the actual environmental effect of CFLs is the subject of much debate. CFLs typically use mercury vapor and need to be properly disposed.
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