The basic principle of generating light of halogen lamps is same as incandescent lamps; Thermal radiators. One problem with incandescent lamps is that as time passes, the glass bulb turns black due to the evaporation of the filament. The technology of preventing the blackening of the glass is the adding of halogens to the gas mixture inside the lamp. The improved lamp with longer life time and brighter light than incandescent lamps is called ‘halogen lamp’.

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