Of course I would not rely on a flashlight for defense, but just how many lumens does it take to really, painfully knock out somebody's night vision? I'm thinking of a 500lumen weapon light..got a 120lumen surefire that is not bright enough.
Ice said:@beezaur:
That depends. But you should know, that one needs only some hundredth of a second to close the eyelids, so half a second is a very long time compared to that...
Very true if you want to attack him. If you however should decide to better run away it can come very handy if he doesn't see you for a few more seconds even though the light is not shining at him anymore...Closing eyelids doesn't matter. If you are forcing someone to close their eyes, turn their head, shield their eyes, etc., you have totally overwhelmed their visual abilities. At that stage you have "really messed up an attacker" and have gained a tremendous advantage.