This is a mentally unstable way of dealing with you, lights or not. I would make a police report, after you catch him on the game camera. I would set up 2 cameras, one on the lights and on on the front door. Make sure you set them up when he is not home to see you, and place them where they are not obvious. After doing that. you need to call the police when you have the doorbell ringing issue or your lights vandalized. You need to make a paper trail, should things escalate. Never underestimate your neighbor or his level of mental instability.
A mature stable person would simply talk to you about the flood lights and see if you can come to a mutal agreement about them.