I just received a fenix P2D and I don't understand how to operate it. The Instructions say that you fully depress the button to turn the light on, then a light press will switch brightness levels. When I try to do that it switches from constant power to strobe effect. When I turn the bezel to adjust it, it does the same thing. I can only switch from constant high power to high power strobe, I can't seem to access low power output. Am I doing something wrong?