By the invitation of the company MinebeaMitsumi, our partner in development of luminaries for Smart City, we were part of the congress and the exhibition focused on intelligent cities which takes place in Barcelona (Spain) every year. Three days of inspirational lectures and exchanging experience with companies and institutions which are focused on smart solutions in various fields, such as transportation, engineering, land-use planning, digitalization, environment and many others. For us, as the producer of LED luminaries, were very valuable encounters with companies which develope software and hardware solutions related to effective managing (not only) public illumination and its connection to other parts of infrastructure.