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The Big Switch to LEDs
EFY Times.com
19 Dec 2015

LED lights also known as light-emitting diodes are semiconductor instruments capable of producing visible light once electrical current passes through them. LEDs have been prevalent for a long time. They are commonly used in digital clocks, computer screens and traffic signals, however, they were not viewed as a traditional source of light.

Web Source: http://efytimes.com/e1/179669/The-Big-Switch-to-LEDs