Holland has had bat-friendly red LED lights on for some time:
Holland’s newest red-light district is a big boost for bats (MAGAZINE) | LEDs Magazine
Bat-friendly Dutch district paints the town red every night – BrightVibes
With thanks to the Bored Panda blog, taking us through some SolarPunk memes:
The “Solarpunk” Online Group Shares 30 Environmental Memes | Bored Panda
Here’s the science:
Red lighting may have a reduced effect on bats compared to lighting of other colours, as bat vision is more sensitive to shorter wavelengths (blue and ultraviolet light) than longer wavelengths (red light)
Use red lighting rather than other lighting colours – Conservation Evidence
It’s now happening in the UK, with Worcestershire carrying out a trial in 2019:
Red LED streetlights make UK road bat-friendly
How did the bat cross the road? By going to a safe red-light area | Wildlife | The Guardian
And more are being installed this year: