Yep, i'm colorblind too. It is extremely difficult for me to see blood on the ground or on trees and brush. If it isn't an very heavy trail, I have to basically follow it on my hands and knees. I still remember when i found my first spot of blood by myself. I was so excited and i hadn't even found my deer yet.

mobow, is right with the green LED light. I've used the blue, the white and the green, but the only one that actually helped me was the green light. The blood appeared to be black to me also.

craitchky, the UV light sounds interesting. I might have to try one of those, where'd you get it?

Kamil, as for the pins...I don't pay attention to the colors. They could all be the same as far as I'm concerned. In my head they're labeled as 1st, 2nd, 3rd and 4th.