Nowadays, there are mainly halogen headlights, xenon lamps and LED lights on the market. Let's take a look at the principles of the three lights.
At present, halogen lamps commonly used in automobiles are upgraded versions of incandescent lamps. Halogen elements are added to generate a chemical reaction between halogen elements and tungsten wires. Halogen headlights not only improve brightness but also have a long life. When we watched the vehicles on the road at night, the headlights were yellow and the vehicles were equipped with halogen headlights. From the effect point of view, due to the low color temperature of the halogen headlights, the color of the light is warmer and yellower. In the case of dark light, the yellowish halogen lamp is not as conspicuous as the xenon lamp, but it is no problem to meet the normal use at night.
The xenon lamp is filled with an inert gas such as helium gas in a quartz crystal glass tube. In a high pressure environment, helium gas is ionized between the two poles of the power source to produce a light source. The brightness of the xenon lamp is three times brighter than that of the halogen lamp. The disadvantage of hernia is that it is very prone to fever and often gets roasted yellow. And the start up is slow.
LED lights are light-emitting diodes. Its basic structure is an electroluminescent semiconductor material chip, which is cured with silver or white glue to the support, and then connected to the chip and circuit board with silver wire or gold wire, and then sealed with epoxy resin to protect the interior. The function of the core wire is to install the outer casing, so the seismic performance of the LED lamp is good.
Let's take a look at the difference between the parameters of the three lights.
rain and snow weather penetration, even lightCompared with xenon lamps, halogen lamps are not completely inferior. They have the advantage that xenon lamps do not have: halogen headlights + reflectors, without the help of lenses, the brightness of the light is not as bright as that of xenon lamps, but relative The brightness of other areas is relatively uniform, and there is no obvious visual attenuation zone.
In addition, halogen headlights with lower color temperature have a distinct advantage. In low-visibility weather such as rain, snow and haze, the penetration of halogen light source is much better than that of xenon light source with high color temperature.
the color temperature is high and the penetration delay is long.It is a form of light that is commonly used in high-end models. Because of the higher brightness, Xenon headlights are generally better equipped with lenses, so they are sought after by many consumers. Because the color temperature is higher, the xenon lamp can be discerned by the human eye. At present, the color temperature of the mainstream xenon lamp is 4200K-6000K, and the light color is closer to the white light of the midday sun. The closer the color is closer to the sun in theory, the easier it is for the human eye to adapt.
So what are the advantages of xenon lamps? In addition to the higher brightness than halogen lamps, the tungsten-free formula also makes the life longer than the halogen lamp; then the power saving is better, the xenon lamp is only 35W, and the 55W halogen lamp emits 3.5 times or more of the light. , greatly reducing the load on the automotive power system, saving more than 40% of power loss.
The high color temperature of xenon lamp is both an advantage and a disadvantage. On the one hand, it is closer to natural light, making everyone's eyes comfortable, but the penetration of high color temperature is also inevitable, so it is not recommended to use too much when purchasing xenon lamps. The color temperature of the xenon lamp, with 4300K is a good choice. There are also delay characteristics such as xenon headlights. Although the two problems have been alleviated with the development of science and technology, these two problems are indeed insufficiency compared with the more traditional halogen light sources, but then its high brightness and long life are tempting.
The high cost seems to be the only drawback, but 2017 has become very popular.In addition to the above two types of headlights, more and more cars are now using LED lights. Note that this is not a beautiful daytime running light but the headlights of the car.
This type of LED light is a light emitting diode. Lamps made by LEDs do not generate heat due to the illuminating process, the energy conversion efficiency is close to 100%, and the life is too long. Adapting to harsh environments is also the direction of future lighting technology.
High brightness.The brightness of the LED can reach 3 times that of the halogen lamp, so the illumination distance of the road surface is farther, the danger ahead can be found earlier, the driving safety is guaranteed, the life is long and there is no light decay, and the good LED lamp has a life of more than 10,000 hours. Halogen lamps are 20 times higher, and the amount of light is much smaller than that of halogen lamps.
Low energy consumption.The power of the halogen lamp is generally 55W, while the general LED lamp is only 24W, low power consumption and high luminous efficiency, energy saving, no self-ignition, and no burning of the computer board. The principle of the halogen lamp is that the tungsten wire burns and emits heat, so the temperature is extremely high, and it is easy to self-ignite, and the xenon lamp needs to be illuminated by the ultra-high voltage, which brings high inrush current, easily burns the driving computer, and the low energy consumption and low temperature of the LED lamp. To eliminate such phenomena, safe and reliable.