Last weekend I was doing a shallow night dive and all I had with me was a small economy flashlight that I bought at the local big outdoor store. Within minutes of turning this “economy” flashlight on it died on me. The next day I picked up a Princeton Tec Shock Wave LED Flashlight. This flashlight is absolutely amazing with its 400 lumens and 20 hour burn time. The Princeton Tec Shock Wave is also waterproof up to 100m this was a must after the incident with my last flashlight. There is no job to big for this light and, it is astounding how bright the 3 Maxbright LEDs actually are.