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AnthillOmbudsman t1_j162kea wrote

I would be curious when these first started appearing in homes. Wikipedia just focuses on the research rather than the rollout in products.

I figure stereo equipment is a good place to look, and just a quick scan suggests manufacturers weren't putting LEDs in until around 1975. Here's a deck from 1975 that was using the bulbs.

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Bounty1Berry t1_j16qmcx wrote

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.

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