Lots of interesting observations here. Its not just a matter of how much light a unit throws out, but what color that light is. I haven't had to do any after dark tracking in ages, but I was always a big fan of the Coleman liquid fuel double mantle lantern, or the 6v square battery flashlight but I have really wondered about how well LED lights work to show blood since they have a different color light, and how that compares to an incandescent bulbed flashlight. Somebody also mentioned a blue lens working well. I lave long ago replaced my "walking out" flashlight with an LED one as its tiny and puts out more light, and needs less battery, but I am very interested in people's observations about what light colors will better show blood. Sounds like these tracking lights do seem to help a little bit, just not $60 worth of help so if they sold for a realistic price of an LED flashlight with differenet color LEDs, they might be worthwhile.