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A New Source of Green Energy: LEDs

A few years from now, morning will break on a weekday and a cadre of workers will file into a modern office building in an American city. When they first walk through the front door, an array of sensors will detect their presence and bring the lights up, adjusting levels throughout the day based on the time, angle of the sun and the weather.
Light-emitting diodes, or LEDs, will be at the core of these energy-efficient smart lighting systems – chips built into light assemblies connected to a network of other lights and sensors, and controlled by host software that optimizes electricity use.

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