Both the first prototype (EAP-00) and the second generation (EAP-01) WLE system were used for the photocatalytic nitrobenzene reduction to aniline. Figure shows the resulting initial aniline formation rates (obtained via linear regression from the concentration-time-profiles, Figures S27, S28 and S30) in dependence of the photon flux for the two setups. In both cases, the reaction rate closely follows the predicted trend for the photon flux density according to eq. 2, indicating that the reaction rate is linearly proportional to the light intensity, i.e., constant quantum yield. This reaction is known to show inefficiencies at high light intensity as a consequence of insufficiently fast kinetics in the resulting zones of high photon flux. By increasing the light intensity, usually also the maximum locally absorbed photon flux in the system (at the "brightest" spot) increases proportionally, until the reaction kinetics can no longer keep up. This results in the well-known non-linear behavior of the reaction rate with the light intensity as also observed in the present case for external irradiation (Figure ). However, in the WLE system, the light intensity is scaled by the number of emitters, not the individual light source output. Consequently, the maximum locally absorbed photon flux also does not change with higher numbers of emitters, only the number of areas where it is achieved. Therefore, it could be possible to avoid this abovementioned efficiency loss in the WLE system.