A light-emitting diode (LED) is a device that emits light when an electric current passes through it. LEDs first appeared in 1962 as practical electronic components that only emitted low intensity red light. Modern versions can be very bright and are available in a broad spectrum of colors in the visible and even in the ultraviolet and infrared spectrums. They are mainly used in various electronic devices like watches, flashlights, cellphones, displays and many more. Because they have a longer life span and are more energy efficient than regular light bulbs, they have mostly replaced them, especially in household settings.
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