I do most of my deer hunting in the afternoon after work. When I shoot a deer late in the day, I often have to trail it in low light conditions. One valuable trick I learned was to use glow sticks to mark the blood trail. If you lose the trail, you can turn around and see the general direction of travel. Glow Sticks are cheap and they last for hours---just remember to pick them all up as you drag your deer back to camp.