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. 2017 Jan 31;7(1):e1017. doi: 10.1038/tp.2016.262

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Copyright © 2017 The Author(s)

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International License. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-nd/4.0/

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Transition to blue-shifted LED bulbs. Image of Milan, Italy taken in 2015 from the International Space Station after the transition to LED bulbs in the city center. The amount of blue light, known to most strongly stimulate the circadian system, is much higher compared with the surrounding suburbs (http://www.iau.org/public/images/detail/iau1510a/). LED, light-emitting diode.