Good to hear positive stories. Heard back from Sandra at Armytek who suggested it may have something to do with using a protected battery-- However, as you folks know, it says in the directions you can use either protected or unprotected as long as you program the light for the appropriate battery, which I did. I was also using HID Canada's Dark Matter 18650 protected 3100 mHa which is a first class American/Japanese battery. Anyway, I did what Sandra asked and reprogramed the light for use with the unprotected NCR Panasonic which came with the light and the results were even worse-- the light no longer enters moonlight mode, and even more worrisome, gets stuck in high mode and won't turn off. So it seems to me the electronics are defective and the light needs to be replaced, which is what I communicated to Armytek. Again, I am sure they will resolve the problem, particularly as I received the light less than 30 days ago, and their products are covered by a 10 year warranty. However, I think it is important to share information and experiences about the product-- that's part of the reason these forums exist after all. And so far Sandra has handled things well. Again, a real drag as I have another of the same light in the mail for my wife, ordered from the good people at Mackoutdoors. Touch wood that light doesn't give me problems as well!! As I said before, it is one sexy light and aside from this UI problem, I think it is a fantastic light.