Wind turbines, officially known as wind turbines, flash to make them visible to air traffic in the dark. This is intended to prevent collisions with airplanes and helicopters. In Germany, this obstacle marking is regulated by the “General Administrative Regulation on the Marking of Aviation Obstacles” (AVV marking for short). According to the AVV, wind turbines must be marked from a height of 100 meters. To ensure that they no longer flash all night, the use of an Aircraft Detection Lighting System will be mandatory from 2025.