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The so-called LED lamps, as the name suggests, refers to the lighting products using LED (Light-emitting Diode, light-emitting diode) technology as the main light source. LED is a solid-state semiconductor component which use the forward flow of current to the semiconductor coupling of the p-n junction, launch photons after the conjunction of the two carriers of the holes produced from the negatively charged and positively charged electrons separating from the semiconductor. Different types of infrared LED can emit different wavelengths of light from the blue and violet to ultraviolet. In recent years, new development is coated with a fluorescent powder in the blue LED, changing the blue LED into white light LED products. This operation generally requires matching driver circuit (LED Driver) or power supply (Power Supply). The main function of the drive circuit or power supply is to convert AC voltage to DC power, and also completed consistent with the LED voltage and current to drive the mating component. LED lighting bulbs is with small size, light weight, and epoxy resin which can withstand high-intensity mechanical shock and vibration, not broken, and the brightness decay cycle is long, so its life is up to 50,000 to 100,000 hours, far more than the traditional 1,000 hours of incandescent light bulbs and fluorescent tubes 10,000 hours. Since LED lamp life is up to 5 to 10 years, so it not only can significantly reduce the cost of replacement lamps. because of its characteristics with minimal current for driving the LED and lighting effects, in the same circumstances, the power consumption is only half fluorescent tubes, so LED also has the advantages of energy saving and energy efficiency.