Tactical is individual or small unit techniques which enable one to win a violent encounter. Tactical gear is gear which works toward this effect.
TACTI-COOL is modern marketing.
P.S. There is a light for my shotgun... it is on the wall. You can not hunt at night (it is illegal) so I have never seen the point. To each their own, but flicking on the lights and racking the round from behind cover has the desired effect in my experience.