What color light has little effect on bats due to their vision capabilities?

Bats primarily rely on echolocation and have limited color vision, which is largely adapted for seeing in low-light conditions. Research indicates that bats are less sensitive to longer wavelengths of light, such as red light. Therefore, when red light is used in environments where bats are present, it tends to have a minimal impact on their behavior and vision, making it a more suitable choice for observing or working in areas inhabited by these nocturnal animals.

This characteristic of bats' vision allows researchers and conservationists to implement red light without significantly disturbing the bats, as their visual perception is less responsive to this spectrum. In contrast, other colors such as blue or green light can be more disruptive due to bats' relative sensitivity to those wavelengths. Thus, using red light helps minimize interference with bat activity, which is critical for their foraging and navigation.