The processing of the headlamp is well done. The plastic casing is rugged and the screw is even provided with a sealing ring, so that the batteries are protected against moisture. Still, I can not imagine that by keeping the spotlight with proper winter long to me. Now that is not extreme winter more, I could not test it.
The radius of the motion detector can be, unfortunately, not specifically set. From sensors ago I've always quite different results. Sometimes the motion detector sensitive enough to pick from about 3 feet, but usually only at a distance of 2 meters.
The light is comparable to a very good flashlight. The term "Headlights" I would not use it. Not more than if I side by side install two copies.
Since Mr. Beams lights are battery powered, I would use it only as a supplement to already installed Power and Light Sources.
Who must get out at night to the toilet, which can use the spotlight as an ideal corridor lighting, if you do not want to turn on all the lights in the apartment.
The brightness is sufficient in any case for no more than 2-3 meters when using a headlamp.