[Training Camp] Lichuang EDA Small Lamp-956918A

Used in IoT training camp practical projects LED (Light-Emitting-Diode in Chinese means light-emitting diode) is a semiconductor that can convert electrical energy into light energy. It changes the relationship between incandescent lamps tungsten filament luminescence and energy-saving lamps three-primary color powder luminescence. principle, and uses electric field to emit light. According to analysis, the characteristics of LED are very obvious: LED bulbs have long life, high luminous efficiency, low radiation and low power consumption. The spectrum of white light LEDs is almost entirely concentrated in the visible light band, and its luminous efficiency can exceed 150lm/W (2010). Comparing LED with ordinary incandescent lamps, spiral energy-saving lamps and T5 three-color fluorescent lamps, the results show that: the luminous efficiency of ordinary incandescent lamps is 12lm/W and the lifespan is less than 2000 hours; the luminous efficiency of spiral energy-saving lamps is 60lm/W and the lifespan is less than 8,000 hours, the T5 fluorescent lamp is 96lm/W, the life is about 10,000 hours, and the 5 mm diameter white LED light efficiency can theoretically exceed 150lm/W, the life can be greater than 100,000 hours. Some people also predict that the upper limit of LED life span will be infinite in the future. However, the working principle of LED lights makes the heat dissipation problem very prominent in the high-power LED lighting industry. Many LED lighting solutions do not pay enough attention to heat dissipation, or their technical level is limited. Therefore, the actual service life of currently mass-produced high-power LED lights is generally Far inferior to the theoretical value, the price/performance ratio is embarrassingly lower than that of traditional lamps. In order to improve the service life of LED lamps and truly make them suitable for commercial mass production, the LED lighting industry is stepping up the development of new thermally conductive materials, such as thermally conductive plastics, independently or in cooperation with professional thermally conductive material suppliers. High-power LED generally refers to greater than 0.65W. Different products will also have different standards, because currently there is no industry standard that everyone agrees on in the field of high-power LED. The light intensity and lumens are higher than that of low power, but the heat dissipation is also very large. Nowadays, high power is mostly used in single-unit applications, coupled with heat sinks with large effective heat dissipation areas, there are also integrated LED light matrices, but the heat dissipation effect Not very good. Low power is generally around 0.06W. Nowadays, LED flashlights are generally used with low power. Whether the light is scattered depends on the angle of the LED. There are large angles and small angles. The light does not scatter at small angles, but it scatters at large angles. Flashlights on the market are generally made of straw hat heads. good results. Now I am worried that some manufacturers do not pay attention to quality and use defective LEDs as flashlights, which will cause the lamp to die soon. The brightness of an LED is necessarily related to the light-emitting angle of the LED. The smaller the angle of the LED, the higher the brightness. There is no such thing as super bright or not. That is a lie to children. If it is a good quality LED, it doesn’t matter which company it is from. The brightness of all LEDs produced by LED manufacturers is similar, but the production process is different and the service life is slightly different, because everyone uses those foreign LED chips. If it is a 5MM LED, the luminous intensity of white light at an angle of 180 degrees is only A few hundred MCD. If the light intensity is at a 15-degree angle, it will reach more than 10,000 or 20,000 MCD.