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1. What is a LED?

A light emitting diode (LED) is a semiconductor device that emits visible light when electrical current passes through it; it is a special kind of diode.

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2. How does LED work?

LED doesn't have a filament that will burn out, and they don't get especially hot. They are illuminated solely by the movement of electrons in a semiconductor material, and they last just as long as a standard transistor.

3. Can LEDs be used to replace conventional incandescent and florescent light bulbs?

LEDs have been used in many different applications to replace old incandescent light bulbs, firstly in the fields of LED indicator lights for all kinds of electronic devices such as cell phone, calculators, automotive dash panel, LED flashing lights, and so on. Now as the development of brightness of LEDs, they can be used to replace incandescent and florescent light bulbs for general lighting purpose.

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