Lastly, although the exact measurement of the effective optical path length is not a requirement for larger diameter batch apparatus, our methodology (for an overview of the workflow, see Figure ) underscores the importance of radiometric data collection and three-dimensional modeling as a means to acquire detailed photon flux information. This is evidenced by the remarkable correlation between the experimental outcomes and the simulated data presented in Figure . Such congruence virtually eliminates the necessity of conducting chemical actinometry experiments in systems where intensification is not a factor.