Automotive headlight lighting standards, classification and advantages and disadvantages

Today's era is the era of automobiles. With the improvement of people's living standards, it is no longer uncommon to buy a car. For cars, car headlights are very important parts, also known as car headlights and car LED daytime running lights. As the eyes of a car, they are not only related to the external image of a car owner, but also closely related to driving at night or safe driving under bad weather conditions, the use and maintenance of car lights cannot be ignored. The following editor will introduce the relevant content of car headlights, including: car headlight lighting standards, car headlight classification and advantages and disadvantages.

Automotive Headlight Standard

According to the GB7258-2004 "Technical Conditions for Safe Operation of Motor Vehicles", the inspection index of automobile headlamps is the offset value and luminous intensity (cd) of the beam irradiation position. The beam irradiation position of the headlamp shall meet the following requirements:

1. When inspecting the low beam irradiation position of the headlamp for motor vehicles (except for tractors for transportation), the height of the corner or midpoint of the beam cut-off line shall be 0.6H ~ 0.8H(H is the height of the headlamp reference center) at a distance of 10m from the screen, and the horizontal deviation from left to right shall not exceed 100mm;

2. For the adjustment of the high beam single beam lamp of the four-lamp headlamp, the height of the beam center from the ground on the screen is 0.85H ~ 0.90H, and the left deviation of the left lamp in the horizontal position shall not be greater than 100mm and the right deviation shall not be greater than 170mm; The deviation of the right lamp to the left or right shall not be greater than 170mm;

3. When the motor vehicle is equipped with high beam and low beam double beam lamps, the low beam beam is mainly adjusted. For lamps that can only adjust the high beam single beam, adjust the high beam single beam.

Classification and advantages and disadvantages of automobile headlights

1. halogen lamp

Halogen lamps are developed from incandescent lamps. We are already familiar with incandescent lamps. After thousands of attempts, the great inventor Edison finally found a material-tungsten filament, which can emit light when powered on. This is the prototype of incandescent lamps. However, incandescent lamps have a fatal defect that although tungsten filament is powered on, its brightness will be limited by the melting point of tungsten filament, and tungsten filament will volatilize at high temperature, condensation on the shell causes the bulb to black and affects the life. Obviously, this incandescent lamp cannot be directly used in the car, so people fill the incandescent lamp with halogen gas (inert gas), which can effectively increase the melting point of the tungsten filament. And life, under the same power, the brightness of halogen can reach 1.5 times that of incandescent lamps, and the life is also 2 to 3 times that of incandescent lamps.

1. Advantages:

① Fast opening speed;

Low cost and simple production;

Low color temperature, good penetration;

④ In rainy and foggy weather, the penetration of the reflector is better.

2. Disadvantages: low brightness, poor durability and high temperature.

2. xenon lamp

Xenon lamps are abbreviated as HID and refer to high-pressure gas discharge lamps. Its working principle is to boost the 12V voltage to an ultra-high voltage of 23000V, stimulate the xenon gas filled in the quartz tube to make it emit light, and then turn the voltage to about 85V to stably and continuously supply the xenon bulb to emit light.

1. Advantages:

①High brightness, three times higher brightness efficiency than halogen headlights;

Low energy consumption, halogen headlights consume more than 60W of electricity, xenon only 35W;

③It presents blue-white light and has a long range. Compared with halogen headlights, it greatly improves the recognition of road signs and signs;

④Long life, xenon has no filament structure, and the service life will be much stronger than halogen headlights. The service life of a group of xenon lamps is about 3000 hours;

⑤Due to the working principle of xenon headlights, if a malfunction is encountered during use, the xenon lamp will not go out instantly, but will gradually dim until it goes out, so that the driver can have time to cope with the headlight failure.

2. Disadvantages:

①The penetration is too poor. In heavy fog and ice and snow, the penetration of xenon headlights is very weak;

②Poor concentration, and because it is too bright, it is easy to shake the owner of the opposite vehicle and cause accidents, so xenon headlights must be equipped with lenses;

③There is a delay effect. Because of the working principle of xenon headlights, it takes 2-4s to light it up. Therefore, if you need to use the headlights to "shake" the vehicle in front, you want to rely on xenon headlights., That is completely impossible.

3. LED light

LED lights are light-emitting diodes, which are solid-state semiconductor devices that can convert electrical energy into visible light. They can directly convert electricity into light.

1. Advantages:

Energy saving and environmental protection, the energy consumption of LED lamps is 1/20 of that of halogen lamps;

The single LED is small in size, easy to manufacture and design into various shapes;

③ It can be lit instantly, and the xenon lamp is no longer needed to "light up later", and it can be used at any time;

④The brightness is much higher than that of halogen lamps, and the penetration is strong, and the warning light used as a brake light has no pressure;

⑤ Low pressure safety. LED, the first component used in electronics, only needs 12V DC voltage to light up, and there is no need to worry about more than 20,000 xenon voltage;

⑥Low cost of use and long life. The life of LED lights from well-known manufacturers can reach 100000 hours, which means that even if the "life" of the car is exhausted, it is still on.

2. Disadvantages:

① High initial purchase cost;

② Heat dissipation problem, if the heat dissipation is not good, the life will be greatly shortened.

(transferred from xianji net qu miao)