Awards, Dark Sky

Innovative Outdoor Lighting Design Nominated For Award

A bat ‘superhighway’ with specially tuned lighting has been nominated for a Build Back Better Award., a London-based awards program. The streetlights along a stretch of road in Frederiksborgvej, Denmark, have been designed to have a minimal impact on the local bat population while providing the required lux and uniformity levels for Danish road and cycle path standards.

The design practice, Light Bureau, used red light because research shows that it is less disruptive on wildlife while allowing people to find their way and maintaining their dark adaptation, and night vision. The project – dubbed ‘We Share The Night’ – consists of 30 bollards of 1-meter height spaced 30 meters apart to create corridors of complete darkness, allowing for light-shy species to cross.

Where cyclists and pedestrians cross the road, 12 higher poles of 3.5 meters have been placed, creating a change in the environment, helping to improve awareness and increase safety in these specific areas. The light level is 2.5 hemispherical lux and the uniformity is 0.15 in the area where cyclists cross the street.

The Gladsaxe Kommune municipality created an awareness campaign in local media to inform local residents why the project used red light, which is radically different from what people would normally expect from street lighting. The special luminaires were supplied by Danish lighting supplier Focus Lighting AS, a firm with a big commitment to sustainability, with modular design and its own repair and reconditioning workshop.

Designers on the project include Philip JelvardRune Brandt HermannssonHenrik Sode and Allan Nielsen. Photograph by Rune Brandt Hermannsson. Jonas Jørgensen was the project leader for the municipality.

In the coming months, the lighting design will be assessed by judges in the lighting category of the Build Back Better Awards, a London-based award program. The Awards celebrate innovation, creativity, social purpose, and environmental leadership in the built environment, and close to entries on Friday, July 29, 2022.

Check out this podcast for more details.

  • James Benya July 12, 2022, 1:18 PM

    Working with my great friend and colleague Chris Monrad, we encountered similar challenges in trying to find an energy efficient narrow band long wavelength light source for the preservation of astronomy in the city of Flagstaff (i.e. narrow band amber). Basic principles of human visual response tell us that the rods (scotopic vision) are short wavelength sensitive, whereas cones (photopic vision) are medium wavelength sensitive. Narrow band amber is theoretically nearly ideal to the astronomers but is very “inefficient” (lumens per watt). I was surprised to see a red light source, which by definition would be even lower efficacy. In our research, Dr. Alan Lewis noted that human vision falls off quickly at adaptation levels below 1 cd/m2 for monochromatic light, but that can be improved considerably with a small amount of wideband light. That said, I appreciate the effort made by this design team to address the conflicting demands of night darkness for bats and others versus the expectations of continuous lighting of our infrastructure. Unfortunately, when it comes to those expectations, our modern society expects standards to be met with more efficient lighting that ever, and often, with legal consequences if not met. In Flagstaff, replacing low pressure sodium was the challenge, as the source is obsolete and lamps no longer available, but narrow band LED sources are not nearly as efficacious, meaning that lighting power would have to increase dramatically. I think this is a hot topic and this project presents an option that in todays world would be nearly impossible for communities to generally employ. I am interested to see if other readers have comments!

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