SMALL BLUE & RED LED BULB IS BLINKING

LED BULE - LEDs are basically semiconductors that have been built so they emit light when they’re activated. Different chemicals give different LEDs their colors. Engineers made the first LEDs in the 1950s and 60s. Early iterations included laser-emitting devices that worked only when bathed in liquid nitrogen. At the time, scientists developed LEDs that emitted everything from infrared light to green light… but they couldn’t quite get to blue. That required chemicals, including carefully-created crystals, that they weren’t yet able to make in the lab.

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