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. 2011 Nov 1;119(11):a472–a473. doi: 10.1289/ehp.119-a472

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graphic file with name ehp.119-a472.g002.jpg — In 2009 New York City launched a pilot program to assess the ability of LED streetlights to reduce greenhouse gas emissions and improve energy efficiency. However, nighttime exposure to the blue-tinged light may have adverse effects on circadian rhythm.

© Ryan Pyle/Corbis