Retrofit of the Lighting System in Common Spaces of Buildings

This article deals with the possibilities and technical implementation of a lighting retrofit in the common spaces of administrative buildings. These spaces are suitable for retrofit because they contain the same luminaires that can be upgraded. Also the measurements of electricity consumption before and after a retrofit were made to verify the retrofit results. According to the measured values, two kinds of retrofits with different degrees of intelligence were realized. The first is based on motion sensors. The second is based on the motion sensors and measurement the illuminance level to maximize the sunlight usage. The last part comprises the technical and economical conclusion of the implemented systems.