Why Does LED Have A Long Lifespan?
Answer: The light emission mechanism of incandescent lamps is that electricity heats the tungsten wire to emit light. After a considerable period of heating, the tungsten wire will age or even burn out, and the lifespan of incandescent bulbs will come to an end. The light emission mechanism of light-emitting diodes is determined by the special composition structure of the diode. The diode is mainly composed of PN crystal chips, electrodes, and optical systems. When a forward bias is applied to the electrodes, electrons and holes are injected into the P and N regions respectively. When non-equilibrium minority carriers and majority carriers recombine, excess energy will be converted into light energy in the form of radiation photons. The luminescence process includes three parts: carrier injection under forward bias, recombination radiation, and light energy transmission. From this, it can be seen that diodes mainly emit light through the continuous movement of charge carriers, without the phenomenon of aging and burning out. Their special emission mechanism determines that their emission lifetime can last up to 50000 to 100000 hours
We must recognize that there is a difference in the concept between single or multiple white LEDs and lighting fixtures used as lighting sources. Currently, white LEDs developed and produced domestically and internationally are far from meeting the requirements of lighting sources. We should utilize and leverage China's advantages and advanced technologies in developing various small compact fluorescent lamps in the world, seize opportunities, and make achievements in the development of new solid-state light sources. Some major problems faced by white LEDs in realizing lighting fixtures are similar to those that have been solved or are being solved by compact fluorescent lamps
The AC-DC conversion circuit installed in the lighting fixture should adapt to the characteristics of LED current driving
This power supply needs to have a forward current outp