The 8th edition of the UNESCO International Day of Light (IDL) takes place on 16th May 2025. IDL aims to raise awareness of the applications of light science and technology in society and sustainable development, as well as promoting science education through the accessible subject of light. For 2025, IDL will be encouraging activities structured around the theme of Light, Innovation, Society. This theme highlights the significant role of light-based technologies in advancing science, innovation, and societal wellbeing. Activities can be registered on the IDL website.