What Is A Light-Emitting Diode? A light-emitting diode (LED) is a semiconductor device that emits light when an electric current flows through it. LEDs function by converting electrical current into ...

If you're operating your truck in Canada, know that the nation's National Safety Code 11B in fact "does put a percentage" on the number of diodes that can be out before an LED lamp is in violation.

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The question in the title is a tricky one to answer, according to Overdrive colleague Lucas Deal, editor of our sister service-shop publication TPS. The answer varies depending on the light position ...