what is the principle of a car head light ?
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CYCLE PROCESS IN A HALOGEN BULB
The tungsten filament is made to glow by the addition of electrical energy. This leads to metal evaporating from the filament. Thanks to a halogen filling (iodine or bromine) in the light, the filament temperatures increase to almost the melting point of tungsten (approx. 3400 °C).
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