These bulbs contain a gas that produces invisible ultraviolet light when the gas is stimulated by electricity. Illumination is a result of the light reflecting off a white coating inside the bulb. The bulbs use less energy because the process doesn't require heating a filament to produce light. They also last longer than traditional incandescent bulbs.
Courtesy of : "Green Glossary: What it Means to be Green; How to Implement it."
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