IMG_1647Electroluminescence was first discovered in 1907, but the first LED wasn’t created until 1927, although no practical use was found for it. It wasn’t until 1962 that the first visible light LEDs were created, glowing red. In the 70’s other colors of LEDs were discovered, but blue LEDs were not bright enough for practical use until 2002. The 2014 Nobel Prize in physics was awarded for the invention of a practical, high-intensity blue LED, as it opened the door to many applications of LEDs, including replacing incandescent and fluorescent lighting indoors for humans, as well as plant grow lights.

One thought on “A Brief History of LEDs

  1. Amazing, nearly 100 years from their discovery to seeing them used on a daily basis, and the grow lighting industry has been turned upside down with the multiple band widths now available, my only beef is the price of the units!

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