H7 is the model of the bulb. Models are H1, H4, H3, H7, etc. 1.H1 is a high beam bulb; 2.H3 is a fog light; 3.H4 is a light bulb with both far and near beams; 4.H7 is mostly a low beam bulb, but some are also used as a high beam, such as AUDIA6. Among them, H1 is a single-wire one-legged light bulb, H7 is a single-wire two-legged light bulb, and H4 is a double-wire three-legged light bulb. The low beam and the high beam are all in one light bulb. Classification of xenon lamps are divided into six types according to the form of bulbs: high beam with lens, low beam with lens (the above two lamps are generally used in the original xenon lamp system such as PST, AUDI, etc.) Under normal circumstances, the bulb Models: H1 (for high-beam bulbs), H3 (for fog lights), H4 (for high-beam bulbs), and H7 (mostly for low-beam bulbs, but also for high-beam lights, such as AUDIA6).
    The difference between the headlight h1 and the headlight h7 is that the number of terminals is different: the headlight h1 is one connection terminal; the headlight h7 is two connection terminals. The car light h1 and the car light h7 are the interface specification models of the car light bulb. The car light bulb can ensure the safety of the car and illuminate the road in low visibility or night driving, which brings safety and comfort to the car owner. Dismantling method of car light bulbs: 1. Open the hood of the car and remove the light protection cover at the rear end of the headlight assembly; 2. Unplug the power plug of the light bulb; 3. Remove the light bulb holder buckle and remove the light bulb;4. Align the shape of the bayonet of the lamp holder to replace the new bulb and fix it firmly, plug in the power supply, and fasten the buckle; Just put it back.
    H1 is a single-wire single-leg, mostly used for high beam; H7 is a single-wire double-leg, mostly used for low beam; H1 and H7 are also used for individual fog lights; H3 is a special type, generally used for Japanese cars, and other cars. very few.
 Haining Suez Car Lights Co., Ltd. is a car Bulb Manufactures, the main products are H4 car bulb and other products, welcome to inquire!