A light-emitting diode or LED is a type of solid-state which uses a semiconductor to produce light. The first one was invented by Professor Nick Holonyak in 1962 and made a radical change from the light bulbs as LED are driven by direct current, DC. One of the advantages of LED is that it lasts around 50,000 hours approximately and as they have very little UV content they do not attract as many insects as other traditional lights. LED produce little heat and can focus the light in a single direction which leads to studies determine that it has a much smaller environmental impact than the incandescent bulbs.
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