I went to a craft store and got some fluorescent paint in all colors. Just paint the bead and it will stick out like a sore thumb. I had the same problem hunting bog marshes one afternoon. Enough light to hunt but hard to get a sight picture. So I painted the front sight lime green and shot a nice deer almost at closing that afternoon in the shadows. Had it not been for that paint I never would have been able to pick that sight up on the body of the deer.