A tungsten-halogen lamp. In these lamps the filament,a wire made of tungsten one hundredth of a millimetre thick,is enclosed in a small quartz envelope inside the bulb. The quartz envelope contains the vapour of an halogen,such as iodine or bromine,which allows the filament to operate at a much higher temperature than in a conventional tungsten lamp. Therefore tungsten- halogen lamps are characterised by a greater brilliance and also a longer life | |
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Crédit: | Science Photo Library / Trustram Eve, Amy |
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