HID stands for which automotive lighting term?

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High-Intensity Discharge describes a lamp that creates light by passing an electrical arc through a gas-filled tube, usually xenon. In an HID headlamp, a ballast first supplies a high starting voltage to ionize the gas and strike the arc, then regulates current to keep the light steady. This arc discharge produces a very bright, efficient light compared with a traditional halogen bulb, which makes HID a popular choice for automotive headlights. The term captures the method and its efficiency, unlike the other options which don’t refer to this lighting technology in cars.