Light-Emitting Diodes (LEDs) have been around since the mid-1960s. They have nearly replaced incandescent lights as indicators and in digital displays. They're even making inroads into AC line-operated lights. In particular, traffic stop-lights are now often made with LEDs. However, LEDs are not incandescent lamps. They have many qualities of their own, some quite surprising. This article will discuss the general characteristics of LEDs, practical applications, and some of the more unusual...
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