I think that CollenT is right. Or leastways, my two don't.
They don't see too well with them yellow "bug lights" neither. During the summer, I use yellow lights in the barn at night and I've often noticed that they can't see very well in there. When that's all the light they got, they don't even know who I am untill I talk to them a few minutes and let them both smell me real good.
I doubt that they could see a red light at all.
I knowww but riding in the dark is still fun lol. :P
Not for those of us who want to be safe. I'm almost 40 and 2 years ago my horse FELL just walking down a hill. He somersaulted over me, and landed on my leg. I was in a cast with a sprain. I got lucky he did not break my leg. JUST b/c he took one wrong step.
After you go thru something like that, you are a much more cautious rider. I have been riding since I was 10, and I have done things when I was young that I would never do now. I appreciate my life much more now.