Ballast headlight control unit, clear and bright light can help you identify the road ahead and obstacles more clearly, improving driving safety The headlight control module, or HID power regulator, provides the voltage required to activate the headlights and regulates the current to the headlights once they are illuminated 68138776AA Car Xenon HID Headlight Ballast Control Unit Module Importance: A HID ballast is important because it helps power the light and allows current to flow through the bulb, thus keeping the light bright. Another important function is to control the current flowing through the bulb. The module is made of aluminum alloy and plastic, combining durability and lightweight properties., Manufacturer: YUNLL