Halogen bulbs, tubes and capsules are made of quartz, rather than ordinary glass, so they can withstand the higher temperatures. If you touch the bulb with your fingers, the salts and oils from your skin will damage the bulb and cause the heat to concentrate. This can significantly reduce the life of the bulb or even worse cause it to shatter. For this reason most halogen capsule bulbs that you buy will be sealed in plastic inside the box.

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