https://www.candlepowerforums.com/threads/238745
That would be my definition of a "self-defense" light.
Personally, I think a light could potentially serve a very useful purpose in combat, but perhaps not in "self" defense. While my Thrunite XP-G supposedly puts out 300 or so lumens, I still wouldn't call it "blinding" in the sense that I can't look directly at it. And while there would be a blind spot in my vision(pointed it at a mirror from 7 feet away, so approximate distance would be 14 feet), it wouldn't blind me completely.
With that said, it IS very distracting and I won't be able to make out any details of anything in a 2 feet radius surrounding the head of the light. Thus it would be fairly easy to hide an actual self-defense weapon(mace, taser, knife) in plain sight. If your attacker tries to knock your light away while you have a knife held just under the head, he would very likely cut himself without making an attempt to do anything about the knife, simply because he couldn't see it. Ditto if he tackles you.
With a police squad surrounding the suspects, I expect it would conceal the actions of the other squad members.