A year ago, Philips Lighting (now called Signify) announced results of a study which showed that its ClearField red LED lighting didn’t disrupt the behaviour of bats – unlike traditional streetlights. Now, the Dutch town of Zuidhoek-Nieuwkoop has become the first place in the world to use the system.
Many species of bats have evolved to forage in near-complete darkness, and as a result, tend to shy away from white LED and yellowish sodium vapor streetlights. Given that cities are full of these lights, the areas in which the animals can hunt effectively are quite limited. Additionally, the insects that the bats feed upon are attracted to the lights, drawing them into areas where the bats don’t want to go.