rich1.0AmjadAli (npub16e…57q84)https://yabu.me/npub16e78xnqakranpdn4p2w30j3tsg9vxjwaz8mlc2d4py76t0lycm4qp57q84njumphttps://yabu.meLED bulb. The first visible LED was actually created by accident, and it was red only. In 1962, Nick Holonyak Jr. developed the first practical visible-spectrum LED while working at General Electric. But for decades after that, LEDs could only produce red (and later green) light. The strange part? Scientists struggled for over 30 years to create a blue LED, which is essential for making white light (the kind used in modern bulbs). Without blue, you simply can’t produce true white LED lighting. It wasn’t until the 1990s that researchers like Shuji Nakamura finally cracked the problem using gallium nitride. This breakthrough was so important that it led to the 2014 Nobel Prize in Physics. #knowmore