This review by Cambie et al. (2016) provides an up-to-date overview of the applications of continuous-flow photochemistry in organic synthesis, material science, and water treatment. Continuous-flow photochemistry in microreactors offers several advantages over batch processing, including reduced reaction times, higher selectivities, scalability, and the ability to safely handle hazardous intermediates and gaseous reactants. The review highlights the fundamental principles of flow photochemistry, such as improved irradiation of the reaction mixture, reliable scale-up, enhanced reaction selectivity, fast mixing, fast heat exchange, multiphase chemistry, multistep reaction sequences, immobilized catalysts, and increased operational safety. The authors also discuss the materials used for photomicroreactor fabrication, including glass and polymer-based materials, and the light sources employed, such as mercury lamps and LEDs. The review covers historical perspectives, key photochemical transformations, and practical examples of continuous-flow photochemistry in various applications, emphasizing the benefits and potential of this technology in modern chemical processes.This review by Cambie et al. (2016) provides an up-to-date overview of the applications of continuous-flow photochemistry in organic synthesis, material science, and water treatment. Continuous-flow photochemistry in microreactors offers several advantages over batch processing, including reduced reaction times, higher selectivities, scalability, and the ability to safely handle hazardous intermediates and gaseous reactants. The review highlights the fundamental principles of flow photochemistry, such as improved irradiation of the reaction mixture, reliable scale-up, enhanced reaction selectivity, fast mixing, fast heat exchange, multiphase chemistry, multistep reaction sequences, immobilized catalysts, and increased operational safety. The authors also discuss the materials used for photomicroreactor fabrication, including glass and polymer-based materials, and the light sources employed, such as mercury lamps and LEDs. The review covers historical perspectives, key photochemical transformations, and practical examples of continuous-flow photochemistry in various applications, emphasizing the benefits and potential of this technology in modern chemical processes.