Its like night-vision... but not green.
This is an excellent headlamp. I own two but wouldnt 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. Dont ask me how I know.
The 3 brightness levels are perfect (havent 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. Youll 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 Id 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.