ok i went hunting with one of my freinds an he usea blue light while calling. we called in one grey fox but i have called them in befor without even useing a lends. someone once told me that night time creatures (deer, foxes, bobcats, ect.) were color blined which only let them see the green and blue parts of the uv spectrum which would let them see the blue light why u were calling. i have only used red and amber lendses while calling which works great. is there any truth to the varmints being abel to see the blue light at night?

We don't know for sure exactly how predators use the visible light spectrum. Current research suggests that most mammals can distinguish colors (obviously we can) but beyond that we know very little. We would assume that since they can see at night that they can see into the UV spectrum. If they can indeed see into the UV spectrum then the question of whether or not they can see blue light would depend on the presense/amount of middle and long wavelength cones in their retina. If they have few of the long wavelength cones than red light would just look dark to them but they would be able to see green and blue light so that makes some sense. I'm not sure however. If anyone can answer this question I would be greatly interested.

yea i heard that deer(and i guess varmints too) cannot see the red end of the spectrum therefor that is why they cannot see hunter orange. i used to hunt wearing my bluejeens i was told that that was one of the only colorsthat they could destinguish out of the rest. pretty much they told me they could see green and blue.does anyone know if this i true or any info the subject