My neighbor recently installed a powerful floodlight on the corner of his house at least 150 watts if it was 1 watt! The light was pointed almost directly into my backyard telescope pier. It was literally blinding me. It's been this way for a couple weeks. At first I was angry. I mean can't that guy see the effects of the light? But I started thinking he probably just is not aware of where it is aiming. So today I saw him out front and started up a casual conversation about my hobby and asked him if would mind angling the light downwards and away from my telescope. I was afraid this would be awkward but he truly had no idea it was a problem. He said he "completely got it" and was very friendly. Event told me to let him know if he needed to adjust it more after his first try. I just checked tonight and the light is fixed! no problem at all. I am so relieved and happy this ended well. So rather than stew about it, go have a friendly talk with the neighbor. It just might go well!