Why are streetlights in Copenhagen being changed to red?

Streetlights in Copenhagen are being changed to red to reduce light pollution and minimize the negative effects on nocturnal animals, particularly bats.

How does red light affect bat activity?

Research indicates that bats are as active in red light as they are in darkness, while white and green light substantially reduce their activity.

Are there similar red lighting projects in other European countries?

Yes, similar fauna-friendly red lighting projects have been launched in countries like the Netherlands and the UK to help protect nocturnal wildlife.

Home / Environment / Red Lights: A Bat's Best Friend in Cities?

Red Lights: A Bat's Best Friend in Cities?

10 Feb

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Summary

Red LED streetlights in Copenhagen aim to reduce light pollution effects.
Research indicates bats are active in red light, unlike white or green light.
Similar fauna-friendly lighting projects are emerging across Europe.

Red Lights: A Bat's Best Friend in Cities?

Urban illumination in Copenhagen is taking on a new hue, with one major roadway now lit in red. This change is a deliberate effort to reduce light pollution, specifically benefiting nocturnal animals like bats. Research conducted by the Netherlands Institute of Ecology demonstrated that bats remain equally active in red light and darkness, whereas white and green light substantially decrease their activity levels.

This project, spearheaded by AFRY Architects in Gladsaxe, aims to harmonize urban expansion with environmental preservation. Red LED streetlights have been installed on a primary road and cycle superhighway to minimize disruption to a nearby bat colony. Thirty bollards emit a red glow, spaced to allow light-shy species to cross safely while ensuring visibility for vehicles and cyclists.