Light pollution experts worry the bluer nights could disrupt animal and human health.
reconstructed nighttime light pollution in Europe and found an increase in artificial blue lights across the continent. While LED technology can help illuminate poorly visible streets and roads, the authors warn that high amounts of blue light emissions could alter natural nighttime cycles for humans and animals.
One of the greatest risks to artificial light is how it alters animal behavior, says lead study author. “Many times the nighttime is the time to eat, pollinate, navigate, nest, or rest, and all those processes are disturbed by the artificial light,” says Sánchez de Miguel, an astrophysicist studying light pollution at the University of Exeter in the UK.
Scientists have only tracked artificial light before in smaller areas since it’s hard to map on a wider scale. What’s more, other studies have used satellites to produce panchromatic images—gray-scale pictures that combine red, blue, and green bands for high-resolution—but they leave no information on specific wavelengths. The team bypassed this issue using pictures taken on digital cameras by astronauts on the International Space Station.
Cities are turning towards LEDs to provide more brightness to dark skies than the monochrome yellow tone from high-pressure sodium lighting. Another benefit the study authors suggest is that LED lights are marketed as an energy-efficient alternative. However, the findings show LED lights give off more blue light emissions.
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