I've seen a few pigs at close range take a bit of notice on an IR light, but they were maybe 30-40yds from me. They didn't spook, but definitely looked at me for a few seconds. I've also seen several big hogs that had previously spooked off a green weapon-light take zero notice of an IR beam in their faces at 70+ yards.
I have never played with an IR light, I have hunted with a red light, can the human eye see the IR lights we are talking about?
