The one I found in a very short period of time says min 900mW, how does that tie in with your numbers? How low would you have to be and how long an exposure for this to be dangerous in your opinion?
The difference seems to be that Chesty and I have experienced this in real life and it was unpleasant....hopefully nothing more. I would be delighted if what PDR1 is saying is correct and there is no risk. But so far I am not convinced, particularly about the exposure time and the difficulty in aiming, which frankly does not tie in with my experience.