The huge beam of this Walther Pro XL3000 flashlight is generated by three specially configured reflector lenses, each measuring 35mm (Beam Adjustment System). Power is provided by four D-alkaline (1.5V) or four NiMH rechargeable batteries, each with 1.2V, producing a 1850-lumen spot light.
Included:
ANSI FL1 Standard - Technical Data
The American National Standards Institute (ANSI) published in 2009 the "Flashlight Basic Performance Standard", FL1 for short. So you can compare flashlights across manufacturer boundaries neutral. This lamp has been tested to stringent ANSI specifications.