"BEWARE WE ARE WATCHING".
Could this be similar to stalking?
My sister-in-law had trouble with a neighbor like that said:
Those floodlights are annoying though. My neighbor does this. (we live rural so I get the nervous factor but she has 2 huge dogs. ) I think she oes it just to annoy my next door neighbor. They really don't get along. It shines right into her baby's room and keeps her up, supposedly. You shold haveheard the commotion when nice neighbor brought lower wattage bulbs to the nut. She took them then smashed them on her own driveway. I'll have to tell her the mirror idea!
Really just redirecting that light might help the situation.
And on the fence, I agree time to plant. Or move.