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?