The picture on the right = that kind of “foggy glass” seems to happen fairly often in Sofirn flashlights that I receive.
I think the reason is that we’re in a very humid and tropical country.
Several times, I’ve even “mildly complained” to Sofirn about this issue, though Sofirn replied it’s a bit difficult to eliminate when their warehouse may also be in a relatively humid area (+ the change in temperature during transportation)…