Blue light like that from smartphones linked to some cancers, study finds

By Mark Lieber, CNN

Updated 2041 GMT (0441 HKT) April 27, 2018

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The Sixth Street bridge over the Los Angeles River looks a bit different with old, left, and new streetlights.
Photos: Los Angeles LED streetlights
The Sixth Street bridge over the Los Angeles River looks a bit different with old, left, and new streetlights.
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Hoover Street
Photos: Los Angeles LED streetlights
Hoover Street
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Ocean Front Walk in Venice
Photos: Los Angeles LED streetlights
Ocean Front Walk in Venice
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