I use a Sure-Fire, L4 Lithium powered LED light for general carry. Small, compact, tough as a nail (probably indestructible) and at 100 lumens - - - if you can't shoot him - you can blind him. About $160.00 Yeah, I know, I hurt my wrist writing the check but it's worth every dime of it - - - and more.
I recently purchased a Tac-Star T6 with a zenon bulb. ( $70.00) to mount on the front of my household, garden variety shotgun. While it's a lot brighter than the Eveready, 2 D cell job that my wife keeps in the kitchen drawer it "sure ain't no Sure-Fire".
I will probably "spring" for another Sure-Fire for the shotgun and relegate the Tac-Star to the kitchen drawer.
Y'all have a really great day.
BLACKJACK