Tuesday, 26 February 2013

HOW HID WORKS

It is usually being considered that In the HID (High Intensity Discharge) headlamps xenon is used as the weapon of choice but the fact is in a HID kit there might be mercury vapors, metal halide, ceramic metal halide etc. Although most of the HID lights are commonly known as xenon light bulbs but not all use xenon despite most of them actually use metal halide lamps of xenon gas.

The HID lights has a distinctive blueish color that separates it from the other lamps due to which it gives a greater amount of light as compare to other in the same electricity power input. HID lights are still mostly used in low-beam operations and very rarely on high-beam lamps, even though the proportion varies by the geographical area.

A HID light do not run on low voltage DC current because of the energy required to run a HID headlight. So they require a power pack (ballast) with either an external or internal ignitor, which controls the current given to the bulb.
The power-up of the HID Xenon bulbs happens in three phases. Firstly, the ignition, when a high voltage pulse is used to produce a spark which ionizes the Xenon gas and create a tunnel of current between the Tungsten electrodes.

Once it is being done and the temperature of the capsule rises, the vaporization of the metallic salt taken place which fails the resistance between electrodes. Then, the ballast come into function automatically and continuously operating through vaporization


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