A tactical flash light is a tool that was originally created and used by military and law enforcement people in the field. They are mainly used to identify an attack in low light situations and is also used to illuminate targets for shooting. Nowadays in addition to these uses tactical flashlights can also be used in many ways for personal self defense. In addition for their use to increase your surroundings awareness specially at night, they can also be used as an impact weapon just like the kubotan.
In the below video Michael Janich is touching on the different uses of the tactical flashlight in different self defense situations.
In the following video, Michael Janich and Mike Seeklander are discussing different practical tips of using the flash light in the field with or without a gun.