The light-emitting principle of incandescent lamp is that electric energy heates the luminous tungsten filament and emits light. After a long time of heating, the tungsten filament will be aged or even burned out, so the life of incandescent lamp will end.

The light-emitting mechanism of light-emitting diodes is determined by the special structure of the diodes. The diodes are mainly composed of PN wafers, electrodes and optical systems. When the positive bias voltage is applied to the electrodes, the electrons and holes are separated from the injected P and N regions. When the unbalanced minority carriers and the majority carriers recombine, they will radiate. In the form of photons, extra energy is converted into light energy. The luminescence process consists of three parts: carrier injection under forward bias, compound radiation and light energy transmission. It can be seen that the diode emits light mainly by the continuous movement of carriers, and there is no aging and burnout phenomenon. Its special luminescent mechanism determines its luminescent lifetime as long as 5-100,000 hours.

1. The AC-DC conversion circuit installed in lamps should be used to the characteristics of LED current drive.

This power supply should not only provide the forward current output near the constant current required by the LED, but also have a high conversion rate to ensure the safe and reliable operation of the LED, of course, pay attention to the cost.

2. Reliability of LED lamps

The main factors affecting the reliability of lamps and lanterns are LED devices and the above-mentioned electrical components.

3. Heat dissipation of lamps and lanterns

The victory of single LED thermal conductivity is not equal to the treatment of heat dissipation of lighting source lamps. With the development of high power, large scale and high brightness chips, it is necessary to deal with the heat dissipation of LED devices and lamps. Our company's high-power LED lamps use heat pipe heat conduction, thermal radiation and natural air-cooled way of heat dissipation.

According to the HATIZ theorem of LED: when the working temperature of LED is below 25 C, the service life is 100,000 hours, when the temperature is 25-50 C, the service life is 50,000 hours, when the temperature is 50-75 C, the service life is 20,000 hours, when the temperature is 75-100 C, the service life is 10,000 hours, when the temperature is 100-125 C, the service life is 5,000 hours, when the temperature is 125-150 C, the service life is 2,000 hours.

4. Uniformity of luminaire color and optical system

LED fluorescent lamp

Because the light characteristic caused by the special structure of small LED is not the same as that of incandescent bulb and fluorescent lamp. What about the uniformity of light color when combined into lighting fixtures? It is a complex system engineering to distribute the light of "secondary light source" composed of several LEDs and how the optical system of the LED lamps can meet the requirements of the lighting source, which needs to be carefully considered and dealt with.