The HID bulb ballast is important because it provides a voltage that is necessary to light up the headlight bulbs. It also helps control the electrical current transmitted to the bulbs.
HID bulb ballast functionThe ballast is a vital part of the headlight system, its primary function is to manage the intensity of the car's headlight. It regulates the intensity of the bulbs so they won't use up all the power. It is similar to a transformer in that it converts the battery voltage into a precise amount of power that your headlights need to stay on. The ballast is also made to identify bulb shutdown.
Common issues with a faulty HID bulb ballastA faulty HID bulb ballast can lead to uncommon burn marks as well as the lights flickering.