15 minutes is a bit long. And you reduced the time to 1 minute. You can dim them down to it's lowest setting, which should still be good enough to illuminate your property. Also have you tried adjusting your motion zones? Perhaps bring it in closer so that it only activates when there motion on your property? (So as not to be triggered by a person walking on the street or a car) Not saying your neighbor is right, could just be a complainer. Just some suggestions to try and keep the peace. Also them having blackout curtains will help.