If a neighbor adjusted the angle of my back patio light without my permission while I was away, I would approach the situation calmly and respectfully. Here's what I might say to them:
"Hello [Neighbor's Name], I hope you're doing well. I noticed something on my outdoor camera footage while I was away, and it appears that you adjusted the angle of my back patio light. I just wanted to discuss this with you to understand the reason behind it and to address any concerns you might have."
"I believe in open communication between neighbors, and it's important to respect each other's property boundaries. I would appreciate it if you could let me know why you made the adjustment and whether there was a particular reason for it. In the future, it would be great if we could talk to each other about such matters before taking any actions on each other's property."
"I value our neighborly relationship, and I believe that addressing any issues directly and openly will help us maintain a positive and friendly environment. If there's anything you'd like to discuss or if you have any concerns, please feel free to reach out to me anytime."
Remember, approaching the situation with a friendly and understanding demeanor can often lead to a positive resolution and prevent potential conflicts in the future.