Light trespass occurs when stray light shines onto neighboring properties. Light trespass infringes on the property rights of the neighbor who has unwanted light intruding onto his or her property. It can lower property values, reduce the quality of the nighttime environment and be a general irritant. Wouldn’t you want to have the full enjoyment of your property without being forced to live with unwanted light directed onto it?
To eliminate light trespass, shield and aim all lights on your own property so the illumination stays within your own property lines. If you can see the source of the light, that is the bulb or refractive lens, from a neighboring property then that light is committing light trespass.