If the car itself has a headlight height adjustment knob, it can be adjusted to the initial "0" position, that is, the horizontal height. The number represents the downward adjustment height of the lamp, and the larger the number, the greater the downward height. 1 gear has the smallest reduction, followed by gear 2 and gear 3. If there is no headlight adjustment function, the following methods can be adopted: find a person with a height of 180cm standing in front of the car, 7.6 meters apart. Turn on the low beam. At this time, the low beam should be just above the knee and below the hip. If it is higher than the hip, it is too high and needs to be lowered.

Car headlights is divided into:

1, halogen automobile headlight light source

Halogen headlights have a history of 40 years. In fact, halogen headlights are improved incandescent bulbs. In fact, halogen gas is added to incandescent bulbs. Adding halogen gas can make halogen bulbs more durable than incandescent bulbs. Because halogen bulb is omnidirectional, it belongs to astigmatism light source. People use reflectors to collect light.

2. Xenon car headlights light source (HID)

Xenon headlamp is a kind of gas discharge lamp. In fact, the voltage of 12V is instantly raised to the high voltage of 23KV by using a rectifier. This high voltage of more than 20,000 volts will decompose xenon and other inert gases inside the xenon lamp and form an arc between the two electrodes. It is precisely because of the light emitted by the arc that xenon headlights have no tungsten wires, and their service life is very long, which can reach 10 times that of halogen lamps, and the brightness can reach 3 times that of halogen lamps.

3.LED car headlight light source

LED is a light-emitting diode, which was previously used for taillights, turn signals and daytime running lights. Because of its advantages, more and more cars now use LED as car headlights, and its optical structure is similar to xenon lamp, which can condense the light of LED into parallel light through reflective bowls and lenses.

4. Laser automobile headlight light source

Laser headlights emit light beams through laser diodes, and then control the direction of the light beams through lenses. Laser headlight has many advantages of LED headlight, and its brightness is higher than that of LED, and the single laser headlight element is much smaller than LED element, only 1% of the size of LED element. The advantages of laser headlights are high brightness and long irradiation distance.