What is an LED (Light-Emitting Diode)?
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Sources of Visible Light - Introduction to Light Emitting Diodes | Olympus LS
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Light-emitting diode - Wikipedia
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Light Emitting Diodes
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A Light Emitting Diode (LED) Is A Two Lead Semiconductor Light Source. Electrons Are Able To Recombine With Electron Holes Within The Device, Releasing Energy In The Form Of Photons. Royalty Free
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