Aut cum scuto aut in scuto
Spotlight shooting rabbits. Simply attach a .22 magnum rifle.
Or your Brown Bess. Musketry by night!
It's probably used to blind enemy snipers/artillery units/other bad guys, judging by the fact that you can go blind even from looking at usual flashlight nor searchlight,those heck-of-a-lumens can burn your eyes to hell with only one click of a button, even if you'll be some miles away from it. Some crazy futuristic star wars-kinda laser. But don't mind having one, for personal protection)