A brighter future awaits radiotherapy if Flash and LIGHT live up to their promise. Announcements made last week by Varian Medical Systems and Advanced Oncotherapy plc indicate results should be seen soon. Varian reported that the first human clinical trial of Flash, Fast-01, completed its treatment phase last week at the Cincinnati Children’s/University of Cincinnati Health Proton Therapy Center. Advanced Oncotherapy plc presented results from a modeling study of Linac for Image Guided Hadron Therapy (LIGHT) technology at the American Society for Radiation Oncology (ASTRO) 2021 Annual Meeting demonstrating that LIGHT enables both the high, super-quick dose delivery of Flash and good conformality of dose delivery to tumor tissue.