The light quality of this device is perfect, if it works. After about 3 exchange actions, however, I am of the production quality is not very enthusiastic. The following defects are present: the fixing eye on the lamp is sharp and not trimmed. You lose the lamp for this reason after a short time, because wear through the also less-quality wrist strap. Because this series fault I lost my first lamp. The second lamp had a dark spot in the light beam, the third lamp did not work. The fourth lamp I use now, but I take this now with kid gloves. So rather nothing with "robust" and "waterproof". Here the advertising promises more than it delivers. Two brothers, you can better. (Myself have 5 different Zweibrüder lamps)
