OP, any thoughts on frosting your reflector (not lens) to try to clean up the ringy output?
I'm OK with the rings, in all honesty I don't notice them under normal outdoor use.
ForrestChump, LOL - never noticed the ring until you mentioned it! Maybe it's because I use momentary 90% of the time, or maybe because of my hearing loss. In any case, I tried the same with my 47 and SF lights, and they all seem to make their own kind of noise. I think I'll change the O-rings on mine too.