What is an LED?
LED is a lighting system that uses semiconductors to produce light. First used in the 1960s, they at first only emitted red-colored light, making them excellent for use as indicator lamps in appliances, radios, TVs, watches and machinery screens.
In the 90s, scientists began to find ways to produce high-intensity light from LEDs, paving the way for LEDs to be used as conventional lighting solutions. Advances in the use of silicon and related nanotechnology in the late 2000s has now allowed LEDs to equal and even surpass the performance of incandescent and fluorescent lamps in terms of lighting efficacy, quality, and energy efficiency.