HID works by making an electric arc between two points that travels through xenon gas inside the bulb. Almost two decades later, Audi equipped their R8 with the first pair of all-LED headlights ...
2 Xenon HID lights Xenon, or HID (High-Intensity Discharge ... being turned on and require a separate ballast to operate. 3 LED (Light Emitting Diode) lights LED headlights use a series of ...