Nick Holonyak was sure the LED would replace the incandescent light bulb when he presented it to GE executives 50 years ago. While the incandescent is still king in homes across the nation, the LED has transformed lighting in more ways that Holonyak could have imagined.
From those first dim red displays to powerful streetlights in major cities, the LED has made its mark on the world.
Source: http://www.wired.com/gadgetlab/2012/10/the-history-of-led/
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