The H4 headlight is a specification and model of a type of bulb for automotive headlights (also known as headlights). H4 is a double-wire tripod light bulb. The low beam and high beam are all in one bulb. The standard is 55W for low beam and 60W for high beam, or 90W for low beam and 100W for high beam. The effect of this type of headlight is relatively poor, the lamp bowl is too large, the emitted light is too scattered, and the light is not concentrated enough. If the xenon lamp or LED is changed, the effect is relatively poor, and the divergence is serious, which will cause dazzling to the opposite vehicle, and I can't see anything myself.

　　The following is the difference between h4 and h7 bulbs: 1. H4 and H7 are two different types of bulbs, with different functions and different structures. H4 is generally used as a high beam and a low beam, and H7 is generally used as a low beam. 2. H4 has three terminals with double filaments for far and near light, and H7 has two terminals. 3. H7 has a large irradiation range and a short irradiation distance, but it is difficult to detect objects with dark colors that are still on the road. The H4 low beam and high beam are all in one bulb, which doubles as two purposes.

　　The following is a related introduction: 1. Car headlights, also known as car headlights and car LED daytime running lights, as the eyes of a car, are not only related to the external image of a car owner, but also related to driving at night or in bad weather conditions. close contact. 2. Car light bulbs are used to ensure driving safety when the car is driving at night, and belong to automotive supplies. Poor lighting conditions can easily cause eye fatigue, and can not provide the driver with effective illumination brightness and area. Good car light bulbs can provide higher brightness and more A good field of vision can also improve driving comfort and safety, ensure driving safety, and make driving full of confidence.