A Tactical Flashlight can be seen equipped on an M4A1 in the Fault Line series, as Sgt. Blackburn traverses through low light areas.
In multiplayer, the Tactical Flashlight can be attached on carbines, submachine guns, and shotguns. In addition to lighting up dark areas, the Tactical Flashlight also blinds enemies looking at it, giving the user a combat advantage. By default, it's toggled on and off with the key "T".
A Tactical Light lights up the dark environments with white light. In close quarters the Tactical Light can also dazzle and temporarily blind others, but also reveals your position.