In recent times, there has been a shift towards conducting photochemical reactions in intensified photoreactors. These reactors combine short path lengths with potent light sources, aiming to amplify productivity and selectivity via uniform irradiation profiles and increased photon intensities. Such intensified systems are at the forefront of sustainable and reliable photochemical scale-ups, attracting considerable interest from both industry and academia. Some prominent reactor examples include microcapillary reactors, vortex type and oscillatory reactors. However, a crucial aspect to underscore here is that these short path length reactors often do not absorb all photons in a single pass.