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From the following article

The story of a new light source

Robert V. Steele

Nature Photonics 1, 25 - 26 (2007)

doi:10.1038/nphoton.2006.44

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Figure 1 - Unfortunately we are unable to provide accessible alternative text for this. If you require assistance to access this image, or to obtain a text description, please contact npg@nature.com

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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Table 1 - Unfortunately we are unable to provide accessible alternative text for this. If you require assistance to access this image, or to obtain a text description, please contact npg@nature.com

Table 1

Performance comparison of white leds with other light sources. The efficacy of LEDs is now on a par with fluorescent sources but boasts a much longer lifespan.

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