One of my pistols came with a light on it. It was on sale. $449 with the light or $499 for the one without the light. As soon as I got it home the light came off and it will stay off of it. The light will hurt your low light vision, add bulk to the pistol and show the bg right were you are. No lights or lasers for me on my guns.
A gun mounted light has many positives. For a Home Defense gun, you can identify your target. It would suck badly if you shot aunt Martha who you forgot was visitinig (unless you are in her will). From a position of cover, the light will not compromise your safety unduely. You cannot hit with any amound of certainty, what you cannot see.
In life, strive to take the high road....It offers a better field of fire.
"Robo is right" Fuzzball