Halogen light bulb

Halogen light bulb

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Credit: SHEILA TERRY/SCIENCE PHOTO LIBRARY

Caption: Halogen light bulb. This incandescent bulb contains a tungsten filament enclosed in a small quartz envelope inside the bulb. The quartz envelope contains the vapour of a halogen, such as iodine or bromine, which allows the filament to operate at a much higher temperature than in a conventional tungsten bulb. This results in greater brightness and a longer life than standard incandescent bulbs.

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