I've thought about that. I've considered putting a light on my full sized Glock 22 (and even my G19 that sometimes gets carried), and/or keeping my CZ P01 for home defense duties and installing a light. However, that would be an extra, and likely unnecessary, expense.I get your concern about light on the gun. We can always suggest trigger discipline, and nothing says you can't have both a flashlight and a gun light.
That wasn't me.You mention sitting on your stairs waiting.
The set up at my house is, my bedroom is at the top of the stairs and at a slight angle to them. I always keep a light on at the bottom of the stairs. So, if someone was taking their time to break in, I'd call the police with my gun drawn while in my room with the lights off. I'd be concealed by darkness, while the intruder would be backlit while coming up the stairs. If they are already up here, we're likely talking very close quarters so I'd probably go for a knife that is under my pillow.