We first compare the IE-and GDD-tuning approaches for TD-DFT calculations on CT excitation energies because that is the problem that LRC-DFT was originally designed to solve. Tuned values ω IE and ω GDD , using the LRC-ωPBE functional, are depicted in Fig. for a set of transitions with charge-separated character. (The complete data set can be found in Table , assembled from existing benchmarks. ) Optimal values ω GDD are relatively constant across this data set whereas ω IE shows much larger molecule-by-molecule differences, especially for benzothiadiazole and N -phenylpyrrole. With the exception of those two cases plus quinoxaline and a dipeptide, ω IE < ω GDD .