Figure presents the influence of dark state transfer in addition to CW laser driving and cavity loss on PMET population dynamics and rate constants for an uphill reaction with N = 1000. The ET and CW laser parameters are the same as those used in Fig. . Simulations were performed for λ D = 0 (red), λ D = 20 meV (blue), and λ D = 50 meV (green) over a range of Q ∈ [10, ∞]. The simulations were propagated for t = 10 ns because the reaction rates between the dark donor and acceptor states begin to appreciably affect the dynamics around this time and, more broadly, additional dynamics pathways such as non-radiative molecular decay begin to become relevant on these timescales. acceptor populations only slightly decreased with increasing λ D . As discussed before, this is due to the large spectral gap between the UP and the dark states for √ Ng c = 300 meV which greatly reduces the transfer rate from the UP to the dark states compared to smaller collective couplings, such that the phonon bottle-neck effect start to emerge. As a result, when coherently pumping the UP with a CW laser, the fitted rate constants in Fig. are several orders of magnitude larger than those outside the cavity, even for λ D = 50 meV and Q = 10.