Along the same lines as the flash bang idea, I think trip wires of strong fishing line and some bells would be sufficient to startle and scare off most burglars.
The act of creating a ruckus or attracting attention usually scares them off.
It is less dangerous than a flash bang, (believe me if you are in the wrong place, those can fuck you up) and a lot easier to obtain.
Especially if you live in the general proximity.
Maybe add an extended cable with a motion sensor, near the grow area, and the light mounted to your exterior house lights, so when the bells ring, the motion sensor near the grow area will also turn on your porch light looking as though you were awakened and responded.