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Light-emitting diode - Wikipedia
How Light Emitting Diodes Work - HowStuffWorks
Light Emitting Diode or the LED Tutorial - Basic Electronics …
Light-Emitting Diodes (LEDs) - SparkFun Learn
Light-emitting diode physics - Wikipedia
How do diodes and light-emitting diodes (LEDs) work? - Explain …
LED | Definition, Light, & Facts | Britannica
Light Emitting Diode (LED): What is it & How Does it Work?
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LEDs - Light Emitting Diodes - Basic Introduction - YouTube