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The Edison era of light for light's sake is giving way to a new age. Mark Halper reports on LED technology that can tune the body's circadian rhythm in human-centric lighting applications for better health and sleep.
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Lighting is on the cusp of a new human-centric era, in which we can use the same light we use for general illumination to encourage physiological effects such as sleep and stimulation. White light with a strong red spectral makeup might help us sleep. Blue light might help us stay alert and learn. And so on.