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The evolution of automobile lamps and lanterns along with the change of the automobile light source, mainly through the following four stages:
The first generation of automobile light source is composed of fuel (candles, kerosene or acetylene) direct combustion of light, it can meet the requirements of the early light, but has very low light emission efficiency, light intensity, unstable performance, complex operation and other obvious shortcomings.
The second generation of automobile light source is incandescent lamp. In 1879, Edison invented the incandescent lamp, in the United States in the first place in the application of incandescent lamp technology in the Cadillac headlights in 1913, the revolutionary changes in the automotive lighting, automotive lighting has entered the era of electricity. Then, there have been car reflectors, starter, generator and battery and other new technologies, in 1925 began to enter the real time of the automotive incandescent lamp. Halogen tungsten lamp appeared in 1950s, it will soon become the main light bulb.
The third generation of automobile light source is gas discharge lamp (HID). The utility model has the advantages of high luminous efficiency, high brightness, high reliability, etc. the utility model replaces the incandescent lamp and the halogen tungsten lamp as the light source of the new automobile headlamp.
The fourth generation of automotive light source is semiconductor light-emitting diode (LED). LED is a semiconductor pn junction diode, when a positive bias applied to the PN junction, the PN junction system excited by the carrier, by low-energy state transition to high-energy state, when the unstable carrier in the high-energy state back to the ground state complex, according to the principle of conservation of energy, energy excess will release in the form of photons, it is LED electroluminescent principle.
From the current situation and trend of development of technology of LED lights, brake lights LED high in China will further popularize the price declined steadily, LED brake lights, turn lights and fog to start the commercialization, LED auto lamps to the development of personal and artistic direction, while the LED intelligent control system will be rapid development.