Given that the site states with ESP embedding might not be sufficiently self-consistent for such systems, it is advisable to employ the larger ECISD expansion. Using EHF embedding in such strongly-correlated multichromophoric systems showed qualitatively correct results, with average energy errors in range 0.1-0.2 eV, for both ECIS+EHF and ECISD+EHF method. If the individual sites exhibit excited states of higher spin at low energies (e.g., low-lying triplets in systems with singlet ground state), then products of such states (e.g., triplet-triplet products as in singlet fission precursor states) can be expected to be present. In such situations, ECIS results should be cross-checked with ECISD computations, even if ECIS provides accurate spectra, as DLE configurations are dark.