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 1Pc 5DV009720-00 5DV 009 720 00 1232335 5DV00972000 Xenon Headlight BALLAST For Astra J For Insignia FUNCTION - Headlight xenon ballasts use electronically excited gas to illuminate the HID xenon bulb, significantly extending its life while maintaining brightness levels. This makes it the best solution for improving visibility. Installation: The adaptive curve light control power module compatible control unit can be installed on the left or right headlight, replacing the drive module of damaged cars and old headlights, the installation is simple and no modification is required., Manufacturer: YUNLL