Light-emitting diodes are called LEDs for short. They are made of compounds containing gallium (Ga), arsenic (As), phosphorus (P), nitrogen (N), etc. Light-emitting diodes are commonly used light-emitting devices that emit energy through the recombination of electrons and holes to emit light. They are widely used in the field of lighting. Next, the editor will give you a detailed introduction to the production process of light-emitting diodes. Chip Inspection Microscopic inspection: Whether t
Users represented by urban street light management departments are more concerned about the maintenance performance of street lights. According to the analysis, the maintenance performance of the sodium lamp is good. The lamp only needs to be scrubbed and does not need to be replaced. The ballast is rarely replaced. The light source is replaced once every 3 to 5 years, which is also very convenient. For LED street lights, LED tubes, modules (including lenses, etc.), power supply devices, etc., c
The lighting installation power of the two should be compared on the premise of reaching the same illuminance (brightness) level and similar lighting quality standards. Because the high-power high-power tube (250~400W) of the high-pressure sodium lamp has high luminous efficiency, it can reach 130~1401m/W, while the luminous efficiency of the low-power tube (100~150W) is about 80~1001m/W, while the current high-power LED 1W LED tubes are mostly used in street lamps, and their luminous efficiency
At present, my country is creating a resource-saving and environment-friendly society, and the concept of "green lighting" is gradually gaining popularity. With the continuous advancement of science and technology, the rapid development of semiconductor material application technology, low-power LED light sources have been widely used in landscape lighting, and high-power LED street lights have also attracted more and more attention from all aspects.LED (Light Emitting Diode), a light-
Next, let’s analyze the cost of laying cables for two light sources on a three-segment road. The load flow of the traditional street lamp trunk cable on a 3 km road is I=P/U=202*250/220=230A, which requires a cross-sectional area of 60mm2. The unit price of copper core cable is 120 yuan/meter, and the cable cost is 120*3000=360,000 yuan. The load flow of the LED street light trunk cable is 1=P/U=202*50/220=44A, which requires a cross-sectional area It is a copper core cable of 10mm2, which requi
The main types of light sources used in traditional street lighting are: metal halide lamps, high pressure sodium lamps, incandescent lamps, and energy-saving lamps (compact fluorescent lamps). Among them, high-pressure sodium lamps have the advantages of high luminous efficiency, energy saving, and moderate color temperature, and are the most widely used in street lamps. However, LED street lamps have more advantages than high-pressure sodium lamps. Economic evaluation of LED street lights
At present, there are many types of LED products used in lighting. Among the many products, street lamps have an important impact on people's lives. This section will focus on domestic and foreign manufacturers and LED street lamp products to analyze the advantages of LED lighting applications. Mooncell Company of the United States began to produce LED street lamp products in 2003, and currently has launched three LED products for street lamps, among which Econo-LumTM is a more practica
conceptUtilization factor (U) is the ratio of the luminous flux directly illuminating the road surface to the luminous flux emitted by all light sources, and is related to the height, elevation angle, arrangement method, and road width of the street lamp.Luminous flux (Φ) is the sum of the energy emitted by the light source and received by human eyes. Indicates how much light energy is radiated per unit time, and the unit is lumens lm. Other representation methods: cd.sr (cd is the unit of lumin
By paying attention to and understanding the development history of photodiodes, we know why the components are produced, the defects in the application process and the improvement measures proposed for the shortcomings. These will be the reference basis for our research on photodiodes. Next, the editor summarized the development history of photodiodes, and you are interested to know about it.1. The budding period (before 1975): The typical IV curve of avalanche mode appeared in 1957. The patent
Whether a person is healthy or not depends on a person's mental, social and other aspects in a good state. The heart is one of the important organs of the human body. Its role is to promote blood flow and provide adequate blood supply of oxygen and nutrients for organs and tissues. If a heart attack occurs, the health of the human body will be affected. Therefore, there must be a An instrument that can detect the health of the heart. The heart rate tester can detect the heartbeat frequency a
The photodiode is a special diode that converts the light signal into a current or voltage signal. Its structure is basically the same as that of a traditional diode. It has a PN junction. However, when designing and manufacturing the photodiode, try to make the area of the PN junction smaller. Large, in order to receive incident light. Its basic principle is: when light hits the photodiode, the absorbed light energy is converted into electrical energy. The photodiode works under reverse
In self-driving cars, lidar plays a key detection and guidance role. In fact, the more advanced and sensitive the device is, the more accurate the detected signals will be, and the more significant the application advantage in actual driving. In the research of this equipment, adding a near-infrared silicon photodiode can improve its sensitivity. Next, I will discuss with you the role of near-infrared silicon photodiode in lidar. Near-infrared silicon photodiode, its sensitivity is one-third h
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