I bought one pack of Nocturnals last year, out of the 3, one died after a few shots, another after one shot, and that was into a deer. The deer bounded off with my arrow embedded in its shoulder, sadly I did not recover the deer, good news is I’m still getting pics of him. No penetration, and yes heavy arrow setup. But that arrow I ended up recovering the next morning and had it still been working that evening I may have slept a little better that night. And the last one was still working I assume but can’t confirm because I GAVE it away. Just didn’t have luck with the Nocturnals. Maybe they used to be better, I dunno. I can’t get on board with 1 or 2 out of 3 working. Hoping to have better luck with the Nufletch Ignitors. So far so good but haven’t extensively tested yet.