No, you cannot do that. As a matter of fact, you are describing pre-meditation. That can get you life in prison.
I know a man whose wife was cheating on him. The boyfriend called the husband and said, "I'm coming over right now to kill you. I told you she is mine." The man went into the hallway of his apartment, unscrewed the light bulb then went back into his apartment with the lights off. He called the police who arrived too late. When the man broke down the door, the husband shot him dead. The husband went to jail for voluntary manslaughter--because he unscrewed the lightbulb, that made it pre-meditated. This happened in Pennsylvania, and each state has different laws.
The law is for self defense or the defense of others--not property. In some laws, criminals who break into your property have the right to sue you if you shoot them! It is true. Especially if they do not have a weapon and their intention was only to rob.
My suggestion, tell your watchman to set the alarm off a few times. When those who are casing your place hear that, they will be deterred. Consider having a dog stay with the watchmen from time to time. Open and close the place at different times. Criminals watch your routines, if your routine is not predictable, they will move onto a different target.
