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2. High-intensity discharge lamp - Wikipedia

   en.wikipedia.org/wiki/High-intensity_discharge_lamp

   HID lamps are used in high-performance bicycle headlamps, as well as flashlights and other portable lights, because they produce a great amount of light per unit of power. As the HID lights use less than half the power of an equivalent tungsten-halogen light, a significantly smaller and lighter-weight power supply can be used.

3. List of automotive light bulb types - Wikipedia

   en.wikipedia.org/wiki/List_of_automotive_light...

   Bulbs used for headlamps, turn signals and brake lamps may be required to comply with international and national regulations governing the types of lamps used. Other automotive lighting applications such as auxiliary lamps or interior lighting may not be regulated, but common types are used by many automotive manufacturers.

4. Headlamp - Wikipedia

   en.wikipedia.org/wiki/Headlamp

   Audi showed the Audi Nuvolari concept car with LED headlights in 2003. [118] [119] [120] Automotive headlamp applications using light-emitting diodes (LEDs) have been undergoing development since 2004. [121] [122] In 2004, Audi released the first car with LED daytime running lights and directionals, the 2004 Audi A8 W12. [123] [124]

5. Hydrargyrum quartz iodide - Wikipedia

   en.wikipedia.org/wiki/Hydrargyrum_quartz_iodide

   Like all HID lamps, HQI lamps operate under high pressure and temperature, and require special light fixtures for safe use. HQI lamps can produce different color temperatures when manufactured with different metal halides. They are relatively efficient light sources producing a high lumen per watt ratio (approximately 6x that of incandescent ...

6. Metal-halide lamp - Wikipedia

   en.wikipedia.org/wiki/Metal-halide_lamp

   Like other gas-discharge lamps such as the very-similar mercury-vapor lamps, metal-halide lamps produce light by ionizing a mixture of gases in an electric arc.In a metal-halide lamp, the compact arc tube contains a mixture of argon or xenon, mercury, and a variety of metal halides, such as sodium iodide and scandium iodide. [7]

7. Halogen lamp - Wikipedia

   en.wikipedia.org/wiki/Halogen_lamp

   To reduce unintentional ultraviolet (UV) exposure, and to contain hot bulb fragments in the event of explosive bulb failure, general-purpose lamps usually have a UV-absorbing glass filter over or around the bulb. Alternatively, lamp bulbs may be doped or coated to filter out the UV radiation. With adequate filtering, a halogen lamp exposes ...