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The blue LED was supposed to be impossible—until a young engineer proposed a moonshot idea.

  • nicerdicer@feddit.deEnglish
    5·
    11 months ago

    Before there were blue LED, the indicator light for full beam was a blue tinted incandescent bulb. My parents had a Volkswagen Passat from the 1980s (?) where the usually blue indicator light for full beam was a green LED, since blue ones were not invented back then.