Leaving the house dark, I would clear it room, by room, up stairs to down. When/if an intruder is found, the flashlight comes on to verify the 'intruder' as friend or foe. If the person is found to be in the wrong house, a command to lay on the floor would be given to the intruder and my wife would be told to call 911. If the intruder complies with the orders, they would get zip tied and informed that they were under citizen's arrest for B&E, etc. If they weren't compliant, they'd be informed that they were under citizen's arrest for B&E, etc and I would use what force I felt would be necessary to detain them until the police arrive.
If, and only if, there is life, limb or eyesight at stake, would lethal force be used.
If, and only if, I need to use deadly force, does the firearm make an appearance. I've been taught my whole life, that if you let a foe know you have a gun, you need to be 100% ready to use it. If the gun does come into play, shot/s will be fired as necessary to eliminate the threat.