DENSO supplies four main components for the system – ballast, auto-leveling controller, leveling actuator and wheel speed sensor.

    The discharge headlamp system has a ballast that controls lighting of discharge headlamp. The system’s auto-leveling controller and leveling actuator use information from wheel speed and height sensors to keep the lamp projection axis fixed in the vertical direction, even when the vehicle is carrying heavy loads in the trunk or accelerating or decelerating. As a result, the discharge headlamp system does not create glare for oncoming drivers.

DENSO Technology – Leading the World

    In 2004, DENSO developed a ballast for the world’s first mercury-free high-intensity discharge (HID) headlamp system that completely eliminated mercury from discharge headlamps (bulbs).
    The newly developed ballast applies increased initial operating wattage and operating current to the mercury-free discharge headlamp, providing bright lighting and long bulb life, equal to the conventional HID headlamp system. The ballast is approximately 50 percent smaller and 25 percent lighter than the conventional ballast, despite its increased initial operating wattage and operating current.