Illuminating the ENTIRE room is probably the best. If you are able to reach a wall switch inside of a room while remaining in a darkened hallway, YOU are not illuminated, and the suddenness of the illumination inside the room can be used to your advantage.
That sounds like good advice. I know when I shined the 3-watt LED MagLite at my neighbor (just in jest), he didn't like it. I think I'll stick with that and skip the NVs.