Beneficial for human night vision while not being materially detrimental (wrt physiological or psychological impact).

https://www.healthline.com/health/why-not-to-have-red-lights...

https://biology.stackexchange.com/questions/2075/does-red-li...

This is looking forward to the day when bats and machines will peacefully coexist bathed in red light.

This would actually be an awesome movie plot. Town adopts red lighting, Dracula moves there, a string of grisly murders ensues, corrupt town bureaucrats refuse to get rid of the red LEDs despite mounting evidence, nightvision/flamethrower-equipped mechs needed to roast out the vampires. Well I guess its not peaceful coexistence.

More or less the plot of Fallen London