What's in a Compact Fluorescent Light Bulb?

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CFLs are known as compact fluorescent lights or compact fluorescent light bulbs. In a CFL, an electric current is driven through a glass 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.

Document Type: 

  • Fact Sheet


  • critical issues, database publication, mineral resources