In-line LEDs are energy-saving and environmentally friendly lighting materials that use visible light, and are solid-state semiconductor devices that can convert electrical energy into visible light. In-line LED, also called plug-in light-emitting diode, is a visible light energy-saving and environmentally friendly lighting material, and a solid-state semiconductor device that can convert electrical energy into visible light. The light-emitting principle of LED is to pass current through compound semiconductors, and through the combination of electrons and holes, the excess energy will be released in the form of light to achieve the effect of light-emitting. The wavelength of the light-emitting diode used for visible light is 400-700 nm.
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