I did compare them. The Carnivore has a bright white light as well as the blood tracker LED. The blood tracker light is no where near as bright, but make the blood really stand out - even at a distance. You could, however, get lost in the woods without the regular light.

The spray sounds intriguing - but it looks like that for blood that is even reasonably fresh, the blood tracker light is going to make it very visible. Actually better than trying to follow a blood trail in daylight.