Sylvania 9005BP Standard Halogen Headlight Lamp
Unlike conventional tungsten-filament lamps which operate with an internal gas pressure of about one atmosphere, our tungsten-halogen lamps operate with an internal gas pressure of several atmospheres to reduce the rate of tungsten evaporation. The combined effects of higher pressure and the halogen cycle give halogen lamps much longer life than that of comparable non-halogen incandescent lamps operating at the same filament temperatures. Conversely, when the two types are designed for equal life, halogen lamps will operate at higher filament temperatures with consequently greater luminance and efficacy.
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