Blue light like that from smartphones linked to some cancers, study finds By Mark Lieber, CNN

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https://www-m.cnn.com/2018/04/27/health/artificial-blue-light-prostate-breast-cancer-study/index.html?sr=twCNN042718artificial-blue-light-prostate-breast-cancer-study0846PMStoryGal



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Melatonin is also known to act as an antioxidant, and adequate levels may be necessary to suppress the growth of certain hormone-sensitive cancers such as breast and prostate cancer, according to Sánchez de Miguel.

Blue light is present in some -- but not all -- outdoor LEDs, particularly those with a color temperature of more than 3,000 Kelvin.

Color temperature measures the spectral content of light: how much blue, green, yellow and red there is in it. A higher color temperature generally correlates with more blue light, according to Richard Stevens, professor of community medicine and health care at the University of Connecticut, who was not involved in the new study.

"The most efficient suppression of melatonin is with that beautiful blue light," he said. "And if you have a light bulb like a fluorescent that has spikes in that region and you turn it on at night, you're more likely to suppress melatonin."

Blue light is also produced inside smartphones 



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