Shawn M.wrote a review of Princeton Tec Quad Headlamp on May 19, 2010
This is an excellent headlamp. I own two but wouldn��t mind having extras. I use it for everything from camping to other night-activities such as cycling at night, fishing and kayaking for lobsters. Oh, speaking of the kayaking part�� The headlamp is definitely waterproof and holds up well to saltwater. Don��t ask me how I know.
The 3 brightness levels are perfect (haven��t needed the strobe). The power curve is pretty steady so its bright most of the way until your batteries go low, then the brightness dies off pretty quickly. You��ll know when it gets close to that point because a little red LED will start to blink at ya (even when its off).
The only thing I��d add to improve this headlamp is the addition of a red lens but I believe there is a ��tactical�� version of this headlamp that handles this.