We are delighted to invite you to join us for the CIE Midterm Meeting Vienna 2025 (CIE 2025), taking place from July 4-11, 2025, in the beautiful city of Vienna. This prestigious event will gather the global community in light and lighting, offering a unique opportunity for professionals, researchers, and enthusiasts to come together and advance our understanding and application of light. The CIE stands as the global authority in light and lighting, driving the consolidation of knowledge and setting the standards for light measurements and applications. Our research agenda is linked to 12 of the 17 UN Sustainable Development Goals (SDGs), highlighting the critical role that light and lighting play in people’s lives, health, and safety. By supporting CIE 2025, you are contributing to an interdisciplinary scientific organization that lays the foundation for industry, design, and human well-being. You will have the chance to reach an audience that spans research, labs, industry, and governance, bridging gaps that no other organization in light and lighting can. In addition to reaching our on-site audience in Vienna, take advantage of our extensive promotional communications leading up to the conference, reaching a global audience over an extended time. Your association with the CIE ensures that your name is linked to the distribution of authoritative, well-established knowledge, recognized and utilized by major international committees and organizations such as the WTO, IEA, ISO, IEC, and CEN/Cenelec.