In 2022, we implemented the replacement of lighting in a multifunctional sports hall 24 x 46 meters in Kostelec nad Černými Lesy, equipped for basketball, floorball, handball, volleyball, tennis, small football and recreational sports. Originally, the hall was illuminated with a total of 28 luminaires, namely discharge lamps, 400 W. On the basis of measurements, a "piece-for-piece" replacement was carried out and all the original luminaires were thus replaced with 28 High Bay LED luminaires, 150 W. Young athletes can thus train in optimally illuminated areas and at the same time save on energy. The total energy savings are now 50 - 60% and the total return on investment was 9 months.