It is essential to clarify that the absorbance term for a single-phase system, represented by 𝐴𝐴 = 𝜀𝜀 𝑖𝑖 𝐶𝐶 𝑖𝑖 𝑙𝑙, can ideally be divided into two distinct components. The first component is influenced by the attenuation properties of the species within the homogeneous medium, denoted by 𝜀𝜀 𝑖𝑖 𝐶𝐶 𝑖𝑖 . The second, the path length 𝑙𝑙, is exclusively affected by the configuration of the reactor and light source. In scenarios with high concentrations, potent absorbing species, or extended path lengths, most of the photons are absorbed. This leads to pronounced absorbance values and, consequently, minimal transmittance. As a result, the fraction of light diminished by the system (represented by the 1 -𝑇𝑇 term in Equation ) approaches unity, implying the reactor absorbs virtually all incoming light. This scenario streamlines the molar balance, rendering the precise depiction of the optical path length in the system redundant. Hence, variations in this path length would have negligible repercussions on the overall molar balance. i