Humans have three types of cone cells which have peak sensitivities to blue light s cones green light m cones and red light l cones.
Red light for nocturnal animals.
Key advantages of green light leds many seasoned hunters have strong opinions about which led to use when hunting coyotes hogs and other nocturnal game.
Research facilities commonly use rodents for study and therefore must address the issue of proper lighting for these nocturnal animals.
The most important consequence of this for viewing nocturnal animals is that red light does not harm their night vision and they continue to function normally when illuminated with red light.
However the green light led is gaining popularity especially for hunting feral hogs and for good reason.
Using red light for night vision is less effective for people with red green color blindness due to their insensitivity to red light.
Red led lighting is ideal for animal research laboratories.
Night time light pollution is rapidly increasing across the world.
I observed this nest for many years using red.
This new spectrum of light 630nm maintains sleep cycles for nocturnal animals such as mice and rats.
With red light you are able to watch and photograph nocturnal animals behaving naturally.
The photo below of a nesting powerful owl was a 1 3 second exposure at f6 3 and iso 6400 illuminated with the headlamp shown above.
Nocturnal animals are likely to be especially affected but how they respond to artificial light is still largely unknown.