The new COST Action PanEuCOPT (CA24127), funded by the European Union with approximately €600,000, addresses the critical challenges by uniting European scientists from multiple disciplines - including photobiologists, microbiologists, pharmacists, physicists, and medical doctors - alongside industry representatives. Over the course of four years, this collaborative network will develop binding guidelines that encompass standardized testing protocols, illumination device specifications, educational materials, and terminology. The ultimate goal is to advance [Photodynamic Inactivation] of microbial pathogens toward clinical trials and regulatory approvals.