HID (High Intensity Discharge Lighting) is the motor vehicle head lighting technology for the new millennium. Unlike halogen incandescent lamps, the HID lamp does not have a filament. Instead, it creates light from an electrical discharge between two electrodes in a micro-environment of Xenon gas, mercury, and metal halide salts that are hermetically sealed in a tiny quartz capsule. The arc tube is encased in a glass jacket to filter ultraviolet rays that could damage plastic parts. The light is emitted by an electrically energized gas formed and sustained between two electrodes. This is achieved with and electronic ballast that controls the arc ignition process.
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Increased Light Output
At least 70% more light at a lower wattage than traditional lamps. Higher Efficiency System than halogen alternatives. 91 lumens per watt (D2S) compared to 18 lumens per watt for a comparable halogen light source.
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Power Wattage
Less poser draw for the same light. HID produces 3200 lumens (D2S) from 35 watts (nominal), commander to 1000 lumens for a comparable 55w 9006 halogen light source.
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Durability
Lack of coil in light source provides increased durability and resistance to shock and vibration.
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Characteristic Life
Tc=2700 hours
3-4 times the life of standard halogen.
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Illumination
Brighter and crisper white light is superior because it is closer to natural daylight compared to halogen sources. Color temperature is ~4200°K compared to ~3200°K for halogen.
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UV Protection
Outer jacket prevents transmission of harmful UV emissions. Polycarbonate lenses can be used in conjunction with HID system.