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Bounty1Berry t1_j16qmcx wrote on December 22, 2022 at 1:54 AM

Reply to comment by AnthillOmbudsman in TIL in 1962 a General Electric engineer named Nick Holonyak developed the first LED light bulb capable of emitting visible red light. The same bulb was used in the 1964 stop animation animated TV special Rudolph the Red-Nosed Reindeer for Rudolph’s bioluminescent nose. by undergroundgeek

I think early LEDs were more commonly used as point illumination.

I have a 1978-model reciever that uses red LEDs for input indicators, but bulbs for lighting the meters and dial scale.