This is somewhat related, I was sitting in my stand and have a cuddeback pointed at a scrape about 18 yards from my stand, A little 6 pointer was digging at it and my cudde took a flash photo. That deer didn't even flinch. I really don't think that light spooks them at all. He didn't even notice and It was pretty cool to see the cam take a pic while sitting in the tree stand above it.