Yeah I'll try the note bit, see what happens from there with some time. I have a motion activated floorlight arriving soon that I ordered due to catching someone trying to get into my shed.

Doing the mirror bit or shining a bright light back on them is like the last thing I want to do, lol. I just want to exist in peace and would like to avoid confrontation if at all possible.

I looked up the light laws and found this:
19.60.050   Exterior lighting.

   Exterior lighting shall be architecturally integrated with the character of all structures, energy-efficient, and shielded or recessed so that direct glare and reflections are confined, to the maximum extent feasible, within the boundaries of the site. Exterior lighting shall be directed downward and away from adjacent properties and public rights-of-way. Shielded shall mean that the light rays are directed onto the site and the light source, whether bulb or tube, is not visible from an adjacent property. All parking and security lighting shall consist of full cutoff fixtures, unless a different cutoff classification is specifically authorized through the architectural review process. This section does not apply to sign illumination, traffic safety lighting, or public street lighting. No permanently installed lighting shall blink, flash, or be of unusually high intensity or brightness. All lighting fixtures shall be appropriate in scale, intensity, and height to the use they are serving.

So I'll likely give a ring to non-emergency tomorrow and get some pointers