Automotive headlights are core lighting devices installed at the front of vehicles, primarily used to provide road illumination during nighttime or low-visibility conditions, ensuring driving safety. Their core functions are divided into low beams and high beams: the former is suitable for urban roads with good lighting, featuring soft light that avoids glare; the latter is used on suburban roads without streetlights, offering a wider illumination range. Modern headlight technologies cover various types, such as cost-effective halogen lamps, which have lower brightness but strong penetration in rain and fog; xenon lamps (HID), which have high brightness and a longer lifespan but start slightly slowly; and LED lamps, which have become the mainstream choice due to their high brightness, low energy consumption, and fast response, commonly found in mid-to-high-end models. Headlight assemblies also integrate auxiliary functions such as position lights and turn signals, and their overall design must comply with local regulatory standards. It is best to prioritize purchasing certified high-quality products to ensure safety and durability.