荷蘭一個新開發的住宅區，鄰近自然保護區，為減輕對當區蝙蝠的影響，決定使用紅色的街燈。夜行的蝙蝠對光線非常敏感，卻不太能看見紅光。

A new neighborhood in Netherlands is near a nature reserve with different rare and threatened species. In order to reduce the impact of artificial lights on bats, they decided to use red streetlights. Bats are nocturnal and light-sensitive, but red is much less visible or even invisible to them.

https://www.mnn.com/earth-matters/animals/blogs/worlds-first-bat-friendly-town-turns-night-red