Its the intesity of the light that matters, not the color. Blue will work just as well as the others. Do you really think a coyote who is blinded by a light really cares what color it is? Wearing blue jeans and using a blue light have little to do with each other in my book. One you are blinding him with the other he just is looking for something different. We have hunted using Red, Amber, Blue, Pink, and White and they all worked. If you want to use it, use it and find out the hard facts.
I know someone who uses a marine light on those foggy nights and does well. I dont know if blue will have the same affect as the marine, but it might. A marine light is not completely blue, but does have quite a bit around the edges and center. I dont recall ever using one on a foggy night, one thing for sure red is poor in fog.
Everyone is quick to jump on the bandwagon and say red is #1, the only thing that will work is red, red, blah, blah, blah. If years ago someone painted their light blue and preached blue to everyone that is all you would hear. Get off the bandwagon and in the field and try it for yourself, its a cheap experiment. A guy I know felt the same way about white last year. I told him to go out one night, use white, and just expect not to call anything. He called me the next week and told me he felt naked not using red, but he killed 4 coyotes and a bobcat before midnight. He said none of the animals acted any different and nothing spooked. Hmmmmmmm Just because you have had really good luck with red doesnt mean nothing else will work. If you havent tried other colors then you really dont have all the facts and shouldnt make comments on them.
Coyotes arent blind to any color, they see them differently than we do, but they are not blind to them. I think of it as black and white and shades of grey. They see them, but it is a shade of grey. I dont think that grey #2 will work any better than grey #8,4,6, or 20. If that shade of grey is burning their hair they probably wont like it. Again intesity is the key not color.
If you want to use blue go right ahead. I will bet you wont be able to tell a difference when watching the animals. Take it from a guy who has used them all. Have fun and tell us how you do.
Todd