Organic torch detector
The torch allows you to see out the blood of wounded game on the soil of the forest thanks to an LED from 480 nm (nanometer) wavelength generates a pure blue light.
This is not a luminol light like the one you see on television, but a special blue light spectrum which increases the contrast between the color of blood and the environment.
Also used by law enforcement to crime scenes.
Glows very particularly high power (250 lumens) as it does not have a filter, but one led at a particular wavelength.