According to the function, the lamp can be divided into: fog lamp, with scattered light type and close irradiation distance. Most fog lamps have a heart-shaped light shape, which mainly takes care of the left and right sides. In places without street lighting, turning on the low beam and headlights at the same time can help you find pedestrians on the roadside earlier and see the activity trend of pedestrians. High power fog lamp is not a good choice, because its light type is very scattered and there is no obvious boundary between light and shade. This projection shape determines that it will make the opposite driver feel dazzling; Moreover, due to the increase of color temperature caused by high power, the light with high color temperature will be reflected by the fog, forming a bright light screen in front of you, and you will completely lose the ability to see things in the fog.
Spot lamp: by adjusting the appropriate spot lamp, the driver can see the road conditions in the range of 100-200m in front of the vehicle, and it is easier to distinguish the ups and downs of the road by using the linear characteristics of the spot lamp. If you find bright spots and black spots in front of you, you'd better slow down in advance to avoid bumping in the bumps. There are many kinds of spotlights with a nominal irradiation distance of 1km / 1Lux or more, but the light intensity that can read newspapers at a distance of 1km or more does not mean that you can observe the road conditions 500 meters away through the spotlight, because the light intensity is inversely proportional to the square of the distance, and the factors affecting the driver's own vision have not been added at this time. Advantages of lens headlamp: in automobile lamps, the light shape of lens lamp cap is the most standard, and there can be obvious light and dark cutting lines, which solves the problem of astigmatism. In foreign countries, xenon lamps are used with standard lenses. This kind of mirror belongs to the category of optical mirror, which we call "lens". Compared with the headlamp with traditional lamp cap, the headlamp with lens lamp cap has the advantages of uniform brightness, strong penetration and small light loss.
According to materials:
LED lamp: LED (light emitting diode, which means light emitting diode in Chinese) is a semiconductor that can convert electric energy into visible light. It changes the principle of tungsten filament luminescence of incandescent lamp and three primary color powder luminescence of energy-saving lamp, and uses electric field luminescence. According to the analysis, the characteristics of LED are very obvious, with long service life, high light efficiency, no radiation and low power consumption. Almost all the spectra of LED are concentrated in the visible frequency band, and its luminous efficiency can reach 80 90 percent .
Xenon headlights also include active front lighting system (AFS): also known as adaptive front lighting system, which can dynamically adjust the headlights according to the steering wheel angle, vehicle deflection rate and form speed of the vehicle, adapt to the current steering angle and keep the light direction consistent with the current driving direction of the vehicle, To ensure the best lighting for the road ahead and the best visibility for the driver, so as to significantly enhance the safety of driving in the dark. As for the working principle of lamps, most of them are xenon lamps. The following is represented by their working principle: xenon headlamp: also known as hid, which is the English abbreviation of high intensity discharge high-pressure gas discharge lamp. Its principle is that the UV cut anti UV crystal quartz glass tube is filled with a variety of chemical gases, most of which are inert gases such as xenon and iodide, and then the 12 volt DC voltage on the vehicle is instantaneously pressurized to 23000 volts through the supercharger (ballast). The xenon electrons in the quartz tube are excited by the high-voltage amplitude, and a light source is generated between the two electrodes, This is called gas discharge. The white super electric arc generated by xenon can improve the color temperature of light, which is similar to the sunlight in the daytime. The current required for HID operation is only 3.5A, the brightness is three times that of traditional halogen bulb, and the service life is 10 times longer than that of traditional halogen bulb. As the xenon headlamp is illuminated by xenon gas discharge, its working principle is that there is no tungsten wire, but it emits light with the help of the arc between the two poles. The arc can usually activate the inert gas xenon, which causes the metal salt to emit light. As the lighting element in the front of the car, the power consumption of the xenon lamp is three times higher than that of the electric lamp in the front space, so that the power consumption of the xenon lamp can be minimized. The luminous flux of a 35W discharge headlamp is twice that of a 55W ordinary halogen lamp, and its color temperature is as high as 4200k or above, which is similar to sunlight. However, it contains more green and blue components, with a general service life of 1500-2500 hours, which is equivalent to all the running time in the average service cycle of the vehicle. It also has a prominent advantage: when it breaks down, it often darkens gradually rather than suddenly does not light up, which can give the driver time. The lamp is not only the lighting tool of the car, but also the front part of the car body. Whether the design of the lamp can be integrated with the overall appearance of the car is the key to whether the whole car shape can be attractive. The design of lamp appearance is also important.