Developments in LED lighting
As part of a general trend toward more efficient energy use, LED (AKA solid state) lighting shows promise.  From EE times.com:
White organic light-emitting diodes (OLEDs) are already producing more light per watt than incandescent bulbs, according to engineering professor Stephen Forrest, but it is trapped inside the device. By fabricating a tandem system of grids [...]
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