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Reference.org
List of LED failure modes
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<p>The most common way for <a href="/facts/LED/gE8x4MDb">LEDs</a> (and <a href="/facts/Diode_laser/TjHzJteV">diode lasers</a>) to fail is the gradual lowering of light output and loss of efficiency. Sudden failures, however rare, can occur as well. Early red LEDs were notable for their short lifetime. </p>