I've harvested 2 deer with mine. Both times they lit up. And...every time I've ever shot them in practice they lit up.

I also shot one at a buck on the day after Thanksgiving. It shot VIOLENTLY to the left in low light conditions....allowing me to see that my arrow had struck a branch. My arrow EXPLODED into pieces......but my Lumenok let me know thearrow didn't injure him.

I arrowed this SAME deer, Saturday....complete pass-through....and the Lumenok was still lit when I got out of my tree to check over two hours later (and it was 14 degees when I got on stand).

Now....Lumenok don't give me anything.....but I'm giving you a true assessment from a person who's actually used them, successfully.

Jeff