We are having a relationship with BUCK d.o.o. for many years. We appreciate their wide competence in developing and manufacturing lighting systems. BUCK d.o.o. and their team are very trustful partners for me and our company. The subject of cooperation with the Buck company was the replacement of the existing luminaires of the fluo generation with modern luminaries with LED light sources. The replacement was carried out in the complete production facilities, warehouses, and offices, as well as the external lighting of the factory area. After ROI analysis and photometric calculations, all luminaries were replaced. All the results listed in the ROI analysis and calculations proved to be correct. The quality of the Buck lamps is at a high level, so I believe that our cooperation will continue on our future projects.