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A critical development was the blue LED. Background article, "True Boo-Roo": wired.com As far back as the 1950s, even before the first practical LEDs were produced, scientists understood that if a semiconductor diode could be made to produce usable quantities of visible light, then they would have a kind of ideal lamp. In terms of conversion efficiency, of economic use of power, of longevity, and of size and weight, such a lamp would be to conventional tungsten lamps what the transistor was to vacuum tubes. That is the vision. Well-put by Mr. Johnstone. | ||||||||||||
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