We find that for both absorption and fluorescence, the E opt -avg 10 FTFC approach matches very well with the more expensive E-sum 100 FTFC approach, generating very similar spectra at approximately 25% of the computational cost, and this, therefore, is our recommended approach for capturing vibronic and environmental effects for spectral lineshapes. The main approximation of the E opt -avg 10 FTFC approach is the assumption of an average FTFC lineshape, which we find here works very well with an average over ten individual lineshapes generated in explicit QM solvent. The E-avg 10 ZTFC approach shows some over-broadening due to outliers from the MD sampling and jaggedness in the spectra but presents a reasonable alternative for 12.5% of the computational cost of the E-sumFTFC method.