The development of automotive LED lighting
With the development of automobile technology, automobile lamps have gradually developed from the most primitive incandescent lamps to halogen lamps, xenon lamps and LED lamps. In recent years, LED technology has played an increasingly important role in automotive lighting systems. From the initial automotive interior lighting such as instrument lights, backlighting, reading lights and other basic lighting applications, it has gradually developed to external lighting such as far and near lights, Daytime running lights, turn signals, high-position brake lights, combined tail lights, etc.
Now the taillights of automobiles have basically been used in all models, and the far and near lights are gradually maturing. Intelligent LED lights and laser lights will be the development trend of future automobile lamps. Although the LED light source is a very ideal light source, it still needs a certain transition period to completely replace the traditional light source. Because of the high production cost of LED light sources, the need to improve technology, and the unsound laws and regulations, it will take some time for LEDs to be fully used in automotive headlights. It is not realistic at this stage to fully replace halogen lamps and xenon lamps.
However, LED technology is constantly improving, and the cost of use is decreasing year by year. It is only a matter of time before the wide and comprehensive application in automotive lighting. Safety, environmental protection and intelligence are the development trend of LED car lights. In the future, more advantageous lighting technologies such as laser lighting will appear to drive the continuous progress of automotive lighting technology.
Advantages of automotive LED lamps
At present, the mainstream headlamps in most cars are halogen lamps and xenon lamps. Compared with traditional car lamps, LED lamps have the following advantages:
(1) Energy saving and environmental protection: LED car lights require low voltage and low current under the same brightness, so they are more energy-efficient than traditional halogen lamps and xenon lamps, and their energy consumption is only 1/10 of that of traditional lamps. LED lamps do not contain mercury, lead and other elements that pollute the environment, and have low energy consumption, which can reduce fuel consumption and prevent damage to automobile circuits caused by overcurrent.
(2) Adjustable brightness and light color: The designer of LED car lights can adjust the brightness and light color according to their needs. The lamp mode can be changed at will, and the shape is more fashionable and diversified.
(3) Long service life and good shock resistance: The theoretical service life of current automotive LED lamps can reach 60,000 to 100,000 hours, and the actual service life of many car lamps has reached the current limit; the LED structure has fewer vulnerable parts and is shock resistant Good sex.
(4) LED components are small in size and light in weight: this advantage allows car manufacturers to be more flexible in lamp design, with higher luminous purity, and clearer and brighter colors.
(5) Outstanding safety: There is no delay when the taillights turn on, and the response time is faster than that of traditional lamps. The response time of LED taillights is only tens of nanoseconds, and the faster response time enables the drivers behind to react earlier; anti-glare interference when meeting the car, will not cause visual obstruction to the driver, so as to reduce the occurrence of traffic accidents. the goal of.
Disadvantages of automotive LED lamps
(1) Poor heat dissipation: Heat dissipation is one of the technical problems of automotive LED lamps, and LED lamps will experience light decay due to insufficient heat dissipation. Because the LED chip is small, the heat conduction is poor, and the LED die temperature is too high and the luminous efficiency will be reduced or even damaged.
(2) High price: The production of LED chips is difficult, and the environment such as temperature and humidity is demanding, so the production cost is relatively high, and the price is relatively high. The higher cost hinders its popularity in the market. For example, in a mid-range car, the LED combined rear lamp is almost twice the price of the traditional incandescent lamp combined rear lamp.
(3) High maintenance price: Expensive maintenance costs are one of the reasons why LED headlamps are difficult to popularize at this stage. Although the theoretical life of LED is very long, once an unexpected failure occurs, the maintenance cost will be as high as several thousand. Because if the LED lamp beads are damaged, you need to replace the entire lamp assembly if you want to repair it. This reason has led many car owners to choose xenon lamps or halogen lamps instead of LED headlights.
(4) Light radiation: Light radiation is a common problem of LED lamps, and LED car lights at this stage are also inevitable. In the design of LED headlamps, the potential photobiological radiation hazards of LED products need to be avoided. The blue light will harm the human cornea to a certain extent, and the flicker and photobiological effects will also cause harm to the human body. With the development of LED technology and automotive lamps, LED automotive lamps must not only meet the technical requirements of automotive lighting design, but also meet the aesthetic requirements of automotive users, and more importantly, meet the safety requirements of no radiation to the human body.
