Highlighted by Noel and co-workers as good reasons for continuous flow photocatalysis, transferring results from batch to continuous flow systems allows for reduced reaction time (due to improved irradiation of the reaction solution), easier scalability, precise control of time and temperature, reproducibility, and faster mixing, among others. This ability to control and accurately tune the physical parameters helps avoid side reactions, and makes it easier to conduct multi-step and multiphase reactions. It was also shown that if physical processes of light attenuation and quenching of active species are accounted for, a relatively straightforward optimisation allows to find the range of optimal designs for photochemical flow reactors. A number of successful lab scale demonstrations of continuous photochemical syntheses were published. For example, Seeberger and colleagues demonstrated a dehalogenation of achlorophenacylacetates in a continuous-flow microreactor using Ru(bpy)3Cl2 as a photocatalyst. Compared to the results in batch (<50% yield in 24 h), the authors achieved 82% yield under 30 mins in flow. Similarly, Noel and co-workers developed a continuous-flow microreactor for trifluoromethylation and perfluoroalkylation of five-membered heterocycles.