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The story of a new light source


Since its humble origins as a red indicator on electronic goods, the LED has come a long way and the latest white-light versions are now surpassing the efficiency of fluorescent lamps.

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Figure 1: Since the invention of the red LED in the late 1960s, every 10 years the light output per device has increased by a factor of 20 while the cost per lumen has fallen by a factor of 10.

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Steele, R. The story of a new light source. Nature Photon 1, 25–26 (2007).

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