Due to the requirements of energy efficiency as well as the increasing importance of energy savings and efficiency improvements, it is essential to focus on the optimization of lighting in buildings. Lighting represents a significant part of energy consumption and therefore it is important to implement solutions that minimize its energy intensity. The use of daylight through efficient window and light pipe design, as well as adaptive shading, can significantly reduce the need for artificial lighting. The introduction of LED technology and intelligent control systems allows not only to reduce energy consumption but also to adapt lighting to actual needs. This paper presents the results of lighting intensity measurements and the subsequent design of a lighting system for power consumption. The performed analysis shows that lighting retrofitting can bring energy savings of more than 30%. In doing so, the proposed solutions combine daylight and artificial light to optimize the lighting according to the actual needs.