Take some advice from a Michigan whitetail hunter. You and I k ow you won't be tracking your deer until you have shot him. That's just how it works. You've spent all summer keeping track of the trails the doe make in the woods. You've picked your spot well, because you have seen many a doe walk by, with the bucks no too far behind. Noe that it's November 15, you have been sitting quietly for hours, just waiting to take that perfect 10 point down with one shot. You hope he drops like a rock within 50 yards, because if he doesn't, that's when the tracking starts. It's only at this point that you need a light to track your deer. It's already wounded, and may be bleading. Hopefully the blood is foamy, since that's what blood from the lungs looks like. He won't get far with a solid lung hit.
I love my Incan lights, especially for outdoors, but you really need an LED light to track blood. So you're on the right track there. Your deer might not even start to bleed out for a good 50 yards before blood starts painting the ground, so some throw is needed here to pick up the trail. Often times, once hit, a deer will fly in a straight path until it reaches dense brush, then change directions fast. Again, that light needs some throw to find the new direction fast.
My suggestion? If you can find an amber filter, that will give you the best contrast. Always hold your light at a low angle, like at your waist. The lower the angle of the light, the more the blood will reflect the light. And blood does reflect light, especially blood that is less than 90 minutes old. A blue filter will often give blood a bright reflective purple hue.
My suggestion? Get a light that will serve many purposes. Get a surefire E2Dl, and get a blue filter for it. Don't listen to people telling you about Cree rings and what not. You won't see any rings ouside in the freaking woods. Get the E2DL. It's 200 lumens minimum, with a good low too. It will run for 2 hours, which is what you'd likely need if you had totrack the deer a couple miles.