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