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I have one of their LED replacements for an older streamlight, I was more concerned with how it dealt with recoil.
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Hmm... well, there are complaints of the streamlight protac railmount hl-x flickering under recoil, and yet mine
don't flicker at all during live fire. However, I can get them to flicker by pulling the charging handle all the way back and releasing ironically. To make matters worse, when I do the same with my m600dfs, they flicker and then lose power until they're only emitting like 10 lumens. I have to turn them off and back on to get them working again. And the surefires even have a spring loaded positive plate.
Omg, somehow posted my streamlights do flicker under live fire instead of don't, they do not flicker under live fire.