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Overview of LEDs



LED (light emitting diode) is a semiconductor that can convert electric energy into visible light.

LED (light emitting diode) is a semiconductor that can convert electric energy into visible light. It changes the principle of tungsten filament luminescence of incandescent lamp and three primary colors luminescence of energy-saving lamp, and adopts electric field luminescence. According to the analysis, the characteristics of LED are very obvious, with long service life, high light efficiency, no radiation and low power consumption. Almost all the spectra of LED are concentrated in the visible frequency band, and its luminous efficiency can reach 80-90%.
Compared with ordinary incandescent lamp, spiral energy-saving lamp and T4 and T5 three primary color fluorescent lamp, the results show that the light efficiency of ordinary incandescent lamp is 12lm / W and the service life is less than 2000 hours, the light efficiency of spiral energy-saving lamp is 40lm / W and the service life is less than 4000 hours, while that of T4 and T5 fluorescent lamp is 80lm / W and the service life is about 80000 hours; The light efficiency of ordinary bright white LED with a diameter of 5mm is 28-30lm / W, and that of imported super bright LED with a diameter of 5mm is 80-90lm / W. Jiangsu Senfa street lamp manufacturing Co., Ltd. applies high-efficiency heat dissipation technology to the imported ultra bright white LED and encapsulates it into an integrated high-power light source. Its brightness can reach 80-100lm / W and its service life can be more than 100000 hours. It has been used on the light source of solar lamps for many years, and the effect is very ideal. Several dozen high-power LEDs are integrated into one lamp cap and used on 8-14m high solar street lamps with luminous brightness of more than 400W ordinary high-pressure sodium lamps.
It is generally believed that energy-saving lamps can save 30% energy, which is a great innovation, but LEDs can save 70% more energy than energy-saving lamps, which is a greater reform of solid-state light sources. In addition, led also has other advantages, high light quality, basically no radiation, which is a typical green lighting source; Reliable and durable; The maintenance cost is extremely low and so on. Because LED has the above characteristics that other solid-state light sources cannot match, LED will be the mainstream light source in the lighting industry in five years.
LED is widely used in signal indication, digital display and other weak current fields with low power consumption and extraordinary service life. Nowadays, the successful development of ultra bright LED makes it more and more used in the lighting industry. The advantages of high luminous efficiency and low calorific value of LED have gradually replaced the trend of traditional lighting sources, which has been widely concerned by people in the industry.
In general, LED lamps have the following characteristics:
★ high efficiency and energy saving only consumes a few kwh in 1000 hours (ordinary 60W incandescent lamp consumes 1 kwh in 17 hours and ordinary 10W energy-saving lamp consumes 1 kwh in 100 hours)
★ the super long-life semiconductor chip emits light without filament and glass bubble. It is not afraid of vibration and is not easy to break. Its service life can reach 50000 hours (the service life of ordinary incandescent lamp is only 1000 hours and that of ordinary energy-saving lamp is only 8000 hours)
★ light health light does not contain ultraviolet and infrared rays and does not produce radiation (ordinary lamp light contains ultraviolet and infrared rays)
★ green and environment-friendly, without harmful elements such as mercury and xenon, which is conducive to recovery and utilization, and will not produce electromagnetic interference (ordinary lamps contain elements such as mercury and lead, and the electronic ballast in energy-saving lamps will produce electromagnetic interference)
★ protect eyesight, DC drive, no stroboscopic (ordinary lamps are AC driven, which will inevitably produce stroboscopic)
★ high light efficiency, low heat generation, and 90% of the electric energy is converted into visible light (80% of the electric energy of ordinary incandescent lamps is converted into heat energy, and only 20% of the electric energy is converted into light energy)
★ the safety factor is high, the required voltage and current are small, the heating is small, and there is no potential safety hazard. It can be used in dangerous places such as mines
★ large market potential, low-voltage, DC power supply, battery and solar power supply, which can be used in remote mountainous areas, field lighting and other places with low power supply.