Do CFLs contain mercury?
CFLs contain a very small amount of mercury sealed within the glass tubing - an average of 5 milligrams - about the amount that would cover the tip of a ballpoint pen. By comparison, older thermometers contain about 500 milligrams of mercury.

Mercury currently is an essential component of CFLs and is what allows the bulb to be an efficient light source. No mercury is released when the bulbs are intact or in use. Many manufacturers have taken significant steps to reduce mercury used in their fluorescent lighting products.

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1. Why should people use CFLs?
2. Do CFLs contain mercury?
3. What are mercury dangers?
4. What precautions should I take when using CFLs in my home?
5. What should I do with a CFL when it burns out?
6. What is mercury?