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Light emitting diodes.

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View Resource Solid-State Lighting

Solid-state lighting is a revolutionary technology that uses semiconducting materials to create light while generating almost no heat. This is extremely energy efficient, but until recently has been impractical due to the small amount of light emitted. New developments in light-emitting diodes (LEDs) have reversed this trend, and strong interest has been shown by the US government and many...

https://scout.wisc.edu/report/nsdl/met/2002/1025