The 2019 International Day of Light in Spain

This paper reports on the main activities related to the International Day of Light (IDL) in Spain throughout 2019. After the success in 2018, the Spanish Committee for the IDL continued the promotion and dissemination of related activities in optics, photonics and the world of light science, and attract students for science and engineering degrees. In particular, a new flagship IDL event in Spain was organized this year at the University of Santiago de Compostela. Moreover, many other interesting activities have been reported. This paper reviews and summarizes these activities related to this international educational project, intended to make our society aware of the importance of light science and light-based technologies.