LW-R25-K radar is installed in the two wind farms of Hoort and Dithmarschen in Germany. It is the core sensor of the automatic control system for aviation obstruction lights in the wind farm. It is used to monitor low altitude wind objects around the wind farm. When there are flying objects close to the wind farm, the aviation obstruction lights automatically light up and usually close. The problem of aviation obstacle light pollution in wind farm is well solved.