The LED LENSER® F1 is not for those with weak nerves. We call it the fighter jet amongst small-flashlights. What this lighting powerhouse has concealed inside such a small housing, is simply breath-taking: Up to 400 Lumen from a single CR123 battery! This world best is achieved by the LED LENSER® F1 as one of the first in its class. But that is just the beginning : HA III anodising in accordance with military standards, watertight (IPX8), electronic regulation with a temperature sensor, tail stand, replaceable glass breakage ring and usage optimized lighting are facts that will convince even the most demanding expert. You'd best get a LED LENSER® F1 fighter jet installed in the hangar at your home as soon as you can.