Denmark is painting the town red—for the bats.

Denmark is painting the town red—for the bats. In a world-first initiative, the municipality of Gladsaxe has switched to red LED streetlights along key roadways to protect local nocturnal wildlife, particularly bat species sensitive to artificial light.
The core scientific insight is that traditional white and blue light spectrums disrupt bats' echolocation and feeding patterns. Red light, however, offers a safe, sustainable alternative that maintains public safety while preserving the local ecosystem.
This isn't just a quirky experiment; it's a smart blueprint for eco-conscious urban planning. The shift reduces light pollution and energy consumption, demonstrating how city infrastructure can meet global sustainability goals (like the UN SDGs) and successfully coexist with nature.

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https://indiandefencereview.com/denmark-just-switched-to-red-streetlights-solving-a-problem-every-modern-city-deals-with/