Surefire has put out some ridiculously bright flashlights in the past. For civilians they sold one called "The Beast" that put out over 2,000 lumens. For military and police, they have a weapons mounted light called the "Hellfighter" that's over 3,000 lumens.

Here's a picture of The Beast in action. The little lights are normal spelunkers headlamps, the Beast is the one lighting up the ceiling.