the in such a small flashlight to be too low luminosity as faulted here sometimes I can not understand, and secondly, do not understand the first place. that they are not the power of 80cm Maglight cudgel of 4 giant cells has needs should be clear ...... but good. I looked at the lamp actually bought for the car when traveling at night time is what you have to look up at dusk or in the motor. the luminosity is very good and if you have to have certain points it quite light, then you have to turn and focus the light egen the head of the lamp. set it emits no kidding about 150 meters far. I have tested myself at night and also measured! 150 meters away can be seen all good even in pitch-dark night. By turning the head is opposed to the light scattered and loses extensive course with large scatter radius and brightness. you just have to individually adjust the way you want it. but for example in cellars or in the attic is still everything so bright that everything is easy to see !. I myself have now with the lamp holder had at night on my bike ..... previously a bicycle lamp but that was against the Lenser L7 rather a joke :). I still have the supplied batteries in the lamp and have you now about half a year. I think the manufacturer's specified burn time is realistic. yet the lamp remains lit without illuminating power loss.