Several inventors made crucial discoveries and inventions that culminated in today's LED (light-emmitting diode) light. It all started in 1907, when H. J. Round discovered electroluminescence - the fact that certain chemicals, when charted with electricity, emit light. Oleg Vladimirovich Losev made the first LED in 1927, but nobody did much with it. Rubin Braunstien added to the research. Robert Biard and Gary Pittman got the first LED-related patent in 1961, but that was for an infrared LED, which radiates infrared radiation (heat), not visible light. The first LED that radiated visible light was a red LED from Nick Holonyak, Jr. in 1962. After that, many others contributed to making LEDs brighter and in more colors, adding control of brightness and color, and bringing down the cost.
To learn more, you can check out http://en.wikipedia.org/wiki/Light-emit … ly_devices
by jesimpki 5 years ago
Have you tried out an LED light bulb yet?If so, what brand and wattage equivalent was it? How would you rate its light output on a scale of 1 to 10?
by Money Man 2 years ago
How do religious people explain the light from distant stars visible every night?Religious people believe that the universe is only 6,000 years old. How then do you explain star light that has traveled millions of light years?
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