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 7P5941591AH Headlight Ballast Control Module Unit Car 7P5.941.591AH Stable Control Our xenon headlight ballasts effectively regulate and control current and voltage to ensure the proper function of your xenon headlights. It ensures a stable power supply and minimizes the risk of a sudden increase in current causing the bulb to overheat or explode. This xenon headlight daytime running light control ballast uses advanced electronic ignition technology to provide stable high-voltage output with minimal interference. It supports up to 10 million flashes without damaging components., Manufacturer: YUNLL