Built for safety & durability
Helps identify threats. Attackers often use the cover of darkness as an advantage. A bright flashlight can help identify threats in a low-ligh Simply shining a light on a bad guy can be enough to get him to take off.
Have you ever had a bright light shined in your eyes when it was dark outside? You probably felt disoriented and even blinded for a bit. You can take advantage of that natural reaction to bright light to defend yourself against would-be attackers.