US car headlight model requirements

Common models: H1, H3, H4, H7, H11, HB3, HB4, etc. These models of bulbs are widely used in different car models.

Halogen lamps: H1, H4, H7 and other models of halogen lamps are more common in American cars, among which H4 has better adaptability and is suitable for most European and American models

Xenon lamps: D1S, D2S, D2R, D3S, D4S, D4R, D5S, D8S and other models of xenon lamps are also widely used, but attention should be paid to environmental protection and life issues

LED headlights: Although there is no specific model, LED headlights are popular because of their high brightness, energy saving and durability
Headlight design regulations
Sealed beam headlights: In 1939, General Motors introduced sealed beam headlights. In 1940, the National Highway Traffic Safety Administration of the United States froze it as a mandatory standard and all cars must use this Headlights

Four round lights: In 1957, the federal government allowed the use of four 5 4/3-inch round lights, which was very popular in American models at the time

Hidden headlights: In the 1960s, hidden headlights became popular in response to regulatory requirements. This design can reduce air resistance when not in use

Rectangular headlights: In 1974, regulations allowed the use of rectangular headlights, but the size was strictly limited. This design gradually replaced the previous round and four round lights

Requirements for intelligent high and low beam lights
FMVSS108: The US FMVSS108 regulations have detailed requirements for intelligent high and low beam lights IHBC, including technical specifications such as lighting control, coordination, and detection