The principle of light emission of incandescent lamps i […]
The principle of light emission of incandescent lamps is that electric energy emits light by heating tungsten filaments. After a long time of heating, the tungsten filaments will be aged or even burned. At this point, the life of the incandescent bulbs is ended, and the light emitting diodes emit light. It is determined by the special structure of the diode. The diode is mainly composed of a PN crystal plate, an electrode, and an optical system. After the forward bias is applied to the electrode, electrons and holes are injected into the P and N regions, respectively. When the balance of minority carriers and majority carriers is compounded, excess energy is converted into light energy in the form of radiation photons. The luminescence process consists of three parts: carrier injection under forward bias, complex radiation and light energy transmission. It can be seen that the diode mainly emits light due to the continuous movement of the carrier, there is no aging and burn-out phenomenon, and its special light-emitting mechanism determines its light-emitting lifetime of 5-10 million hours.
1. The AC-DC converter circuit installed in the lamp should adapt to the characteristics of LED current drive
This power supply must have a forward current output that is close to the constant current required for the LED, and it must have a high conversion rate to ensure the safe and reliable operation of the LED. Of course, the cost must be paid attention to.
2, LED lamp reliability
Factors that affect the reliability of lamps and lanterns are mainly LED devices and the above-mentioned electrical components. The LED light source used by our company is a world-class manufacturer, and the main components of electrical accessories are European and American manufacturers.
3, lamp cooling
The overheating of a single LED does not mean that the heat source of the lamp is solved. With the development of high-power, large-size and high-brightness chips, the heat dissipation of LED devices and lamps must be solved. Our high-power LED lamps use heat pipe heat conduction, heat radiation and natural air cooling.
According to the LED's HATIZ theorem: When the LED operating temperature is below 25°C, the service life is 100,000 hours. At 25-50°C, the service life is 50,000 hours. At 50-75°C, the service life is 20,000 hours. , 75-100 °C, the service life of 10,000 hours, 100-125 °C, the service life of 5,000 hours, 125-150 °C, the service life of 2,000 hours.
4, lamp light color uniformity and optical system
Due to the small LED special structure, the light characteristics are not like the incandescent light bulb and the fluorescent light. There is a problem of non-uniformity of the white light color. After combining the lighting fixtures, how is the uniformity of the light color? The combination of several LEDs The distribution of the light distribution of the secondary light source and how the optical system that constitutes the LED lamp satisfies the requirements of the lighting source is a complex system project, which needs careful consideration and resolution.