A tungsten light source works by passing electric current through a tungsten filament. As the filament heats up, it emits broadband radiation. In a tungsten halogen lamp, halogen gas inside the quartz envelope helps reduce filament material loss and supports more stable operation. The output of a tungsten halogen light source is continuous and smooth, which makes it useful for spectroscopy systems that need broadband illumination instead of a narrow single-wavelength source. Because the lamp generates heat during operation, proper cooling and stable power control are important for measurement repeatability.
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