In this municipality near Copenhagen, red LED streetlights have been installed along key roadways, offering a potential model for cities worldwide grappling with the environmental impact of artificial lighting. The initiative targets light pollution and seeks to reduce disruptions to nocturnal species, particularly bats, which are sensitive to urban light.
This innovative shift is rooted in scientific research and aligns with global sustainability efforts. In doing so, it represents more than just a change in lighting color. It is a rethinking of how cities can evolve their infrastructure to meet pressing environmental goals, preserve local ecosystems, and manage the growing challenges of urban development.
In most urban areas, artificial light serves primarily to ensure safety and improve visibility for pedestrians and drivers. However, growing evidence suggests that traditional lighting systems disrupt natural ecosystems. Species such as bats, which rely on echolocation for navigation and feeding, are particularly vulnerable to artificial light. Research shows that short-wavelength lights – like those in white, blue, and green spectrums – disrupt their behavior, leading to altered migration patterns and disrupted feeding cycles.
In contrast, red-spectrum lighting has been found to have minimal impact on bat activity. In Gladsaxe, the decision to replace standard white lights with red LEDs along Frederiksborgvej, a road near a local bat colony, is designed to protect species such as the common pipistrelle (Pipistrellus pipistrellus) and the brown long-eared bat (Plecotus auritus). This shift is based on evidence that red light interferes less with nocturnal species, offering a sustainable compromise between ecological protection and the need for public illumination.
The implementation of red lights is a targeted effort to reduce the impact of street lighting on local bat populations, ensuring their ability to forage and navigate while maintaining road safety. This innovation follows findings from the Danish Road Directorate, which highlighted how artificial light affects bat behavior in close proximity to their feeding corridors and roosting areas. Gladsaxe’s project has become a key part of Denmark’s broader sustainability strategy, linking urban development with environmental responsibility.
The introduction of red lighting in Gladsaxe is part of the EU-funded Lighting Metropolis – Green Mobility program, which also involves cities across Denmark and Sweden. The program aims to reduce the environmental footprint of urban lighting while maintaining energy efficiency and road safety.
The move to red LEDs aligns with sustainable city goals and offers multiple benefits. These energy-efficient lights reduce power consumption compared to older systems like sodium vapor lamps. Additionally, they require less maintenance and integrate smart lighting technologies that adjust brightness based on real-time data, further improving energy efficiency.
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