I think light power just depends on how much you want to try to blind the person, or just light him up. There's enough ambient light in my apartment that I can usually see anyone. Of course with that being said, I rely on something other than a firearm where I live, don't want to be liable for hurt neighbors, and that's a whole other story...
My light is only 24 Lumens apparently, and I think it'd be more than enough.
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