The amount of mercury in a typical CFL or fluorescent light bulb ranges from 3.5 milligrams to 15 milligrams. Companies have been trying to reduce the amount of mercury in light bulbs but are unable to completely eliminate the use of it in manufacturing since mercury is an essential ingredient for most energy efficient lighting products. “It is the mercury that excites phosphors in a CFL, causing them to glow and give light…Because mercury is consumed during lamp operation, a certain amount is necessary to produce light and achieve long lamp life.”
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