"First, seek out some training in the proper use of a weapon-mounted light. This is important in learning how to use it to illuminate your surroundings while moving with the gun in either a high or low muzzle-aversion carry position, using the “spill” from the beam as well as the “bounce,” or reflected light, off the ceiling or walls to light a room. (Hollywood tends to have everyone running around with WMLs held horizontally at eye-level, in a “what-not-to-do” fashion.)"