By optimizing the emitters, the induction coils and the amplifier, the specific photon flux density in the system could be improved from 37.8 µM s -1 in the initial prototype up to 442.2 µM s -1 , an increase by a factor of 12. The former was hardly impressive and lower than many commercially available setups featuring external irradiation, but the latter corresponds to 145 W L -1 radiant power density which is an order of magnitude above typical conventional photochemistry setups with comparable reaction volumes. Assuming a molecular weight of 200 g mol -1 for the product and unity quantum yield, this setup now allows space-time-yields of up to 7.6 kg L -1 day -1 , meaning that even relatively small reactors in the 1-5 L scale are sufficient for many production processes in the specialty chemicals and pharma industries.