I bought this lamp because it has an enormous amount of lumens per Euro. She is extremely bright indeed and thus ideal for the intended purpose (ski and toboggan tours at night). The lamp looks very high quality. Ingeniously simple solution is the adjustment of the tilt angle of the lamp body: When tensioned the elastic rubber headband keeps the lamp body in position. Since the moment of inertia of the lamp body is very low (mass sits close to the head), accidental adjustment of the tilt angle is eliminated by vibration. The criticized by a Vorkommentator "fiddly procedure of battery insertion" is likely only for farsighted people who go without glasses for works, be a problem.
CAUTION: The lamp does not work with the recommended battery AMAZON "Panasonic NCR18650B_X2 Li-Ion battery (3.7V, 3400mAh)". Batteries are required, in which the positive pole is increased (as with an ordinary 1.5V - battery). The Panasonic batteries will not work unless you eg. A M3 nut glued with conductive adhesive to the positive terminal of the battery.