The core function of automotive headlights is to provide road illumination at night or under low-light conditions to ensure driving safety, and their working principles vary depending on the type of light source. Halogen headlights emit light through the heating of tungsten filaments and use the halogen cycle to extend their lifespan; they are low in cost but high in energy consumption. Xenon headlights (HID) rely on high voltage to activate xenon gas and produce high-colour-temperature intense light, which is significantly bright but requires complex circuit support. LED headlights emit light through semiconductors, combining the advantages of energy efficiency, long lifespan, and fast response, and have become the mainstream choice. Laser headlights use laser diodes to excite phosphors, achieving ultra-long irradiation distances and low energy consumption, but have a high technical threshold. In addition, headlight design must comply with local regulations, such as requirements for high-low beam switching and fog light penetration. With technological development, headlights are evolving from a single lighting tool into an intelligent module integrating environmental perception and interaction, such as working in synergy with autonomous driving systems to further enhance safety and driving experience.
