Thank you for making this a "sticky" again for this year.
I saw no mention of the type of light that works best for blood trailing...
I'll contribute this much. Don't bother with the L.E.D flashlights. Even the ones that claim to be SPECIFICALLY for tracking blood, in fact, suck! You are better off with a regular 'ole incandescent MAGLITE.
But the best light to use for blood tracking in the dark is a Coleman dual mantle propane lantern. I keep one in my truck all season just for this purpose. Makes fresh blood glow!