The ANSI/FL1 standards for beam distance are fairly close to useless, at least in my opinion. In the real world, a flashlight rated for 1,000 meters may only be useful to about 300 or 400 meters, depending on the veracity of the manufacturers specifications. Pesky inverse square law!
From Wikipedia: " The distance in meters at which the flashlight produces a light intensity of 0.25 lux. This is not very bright, about equal to a full moon. This distance is not actually measured. Instead the value is calculated by taking the peak beam intensity measured above, dividing by 0.25 lux, and taking the square root of the result."
One thousand meters is no small span. Despite having good vision, I can't see much of anything at one kilometer at night, even under the brightest moonlight.