1.73010137N 73160057L LAD5G 12Pin D1S D1R Car HID Xenon Ballast Igniter for Jaguar XK XK8 XJ8 (20032009) What it is: A 12pin D1S/D1R HID xenon ballast igniter designed to power and stabilize Jaguar headlights from 2003 to 2009, matching OEstyle D1S/D1R ballast configurations. Key benefits: Protects the headlight circuit with builtin short circuit, open circuit, reverse polarity, overload, and load protection for reliable operation. Quickstart and efficient performance: speeds up the current drive during ignition, reduces power draw, and supports fast, stable headlight startup. Compatibility and fitment: Part numbers: 1.73010137N, 73160057L, LAD5G Connector and format: 12pin D1S/D1R ballast igniter Vehicles: Jaguar models including XK, XK8, and XJ8 from 2003 to 2009 Important: Please verify the OE number of your vehicle's HID ballast to ensure this accessory is the correct match. Practical use scenarios: Replacing a failed HID ballast on a 20032009 Jaguar XK, XK8, or XJ8 to restore reliable headlight ignition and operation. Upgrading an aging HID system on compatible Jaguar models to achieve faster startup and improved power efficiency. Servicing a Jaguar with 12pin D1S/D1R headlamps in a environment, providing a likeforlike ballast igniter replacement for compatibility. Installation and notes: Designed for professional installation or experienced users familiar with HID headlight systems. No additional accessories required beyond the compatible 12pin D1S/D1R ballast framework.