How can I protect myself with an LED Light?

Episode 1353 (29:34)

Robert from Los Angeles, CA
Hausbell 7W Ultra Bright Mini LED Flashlight

Robert wants to know how he can build a bright light to blind a perpetrator if someone tries to attack his sister. Leo says that police LED flashlights are blindingly bright and they will work great. The Lume Cube is small (1 1/2" sq), and is extremely bright.

Here's some suggestions from the chatroom: