Advantages:
1 high efficiency and energy saving. Under the same brightness, led lights 1000 hours only consume electricity 1 degree, ordinary incandescent lamps 1 degree for 7 hours and ordinary energy-saving lamps consume electricity 1 degree for 100 hours. Long service life. The theoretical service life of led lamps can reach more than 10,000 hours.
2 The light is healthy. The light does not contain ultraviolet and infrared rays, no radiation and no pollution; Ordinary energy-saving lamps and incandescent lamps contain ultraviolet and infrared rays.
3 Green and environmental protection. Does not contain harmful elements such as mercury and lead.
4 low-voltage power supply, using low-voltage power supply, is physically safer than high-voltage power supply. In the process of use, the voltage of a single bulb is between 2V and 4V, and the voltage is low, so that everyone can use it more safely without worrying about the harm caused by the power supply of lamps.
The material of led lamps is hard, and the light sources used are all solid, so LED lamps will not flicker during the earthquake. It is precisely because of this particularity that led lamps can stand out from other lamps, and LED lamps have seismic performance. In addition, the service life of led lamps is relatively long. If there is no problem in the process of use, it will be no problem in about ten years.
Light-emitting diode is called led for short. Made of compounds containing gallium (Ga), arsenic (As), phosphorus (P), nitrogen (N), etc.
When electrons recombine with holes, they can emit visible light, so they can be used to make light-emitting diodes. Used as an indicator light in circuits and instruments, or as a text or digital display. Gallium arsenide diodes emit red light, gallium phosphide diodes emit green light, silicon carbide diodes emit yellow light and gallium nitride diodes emit blue light. Because of its chemical properties, it can be divided into organic light-emitting diode and inorganic light-emitting diode LED.
It is a semiconductor diode, which can convert electric energy into light energy. Light-emitting diodes, like ordinary diodes, are composed of PN junctions and also have unilateral conductivity. When a DC voltage is applied to the LED, holes injected from the P region to the N region and electrons injected from the N region to the P region recombine with the electrons in the N region and the P region within a few microns near the PN junction, respectively, resulting in spontaneous fluorescence. The energy states of electrons and holes in different semiconductor materials are different. When electrons and holes recombine, the energy released is somewhat different. The more energy is released, the shorter the wavelength of light is. Diodes that emit red, green or yellow light are commonly used. The reverse breakdown voltage of LED is greater than 5 volts. Its forward volt-ampere characteristic curve is very steep, and a current limiting resistor needs to be connected in series to control the current through the diode.
reference data
LED。 Baidu Encyclopedia [reference time 20 17- 12-20]