The absorption spectra of lycopene in n-hexane and CS2 are measured under high pressure and the results are compared with í µí»½-carotene. In the lower pressure range, the deviation from the linear dependence on the Bayliss parameter (BP) for í µí»½-carotene is more visible than that for lycopene. With the further increase of the solvent BP, the 0-0 bands of lycopene and í µí»½-carotene red shift at almost the same rate in n-hexane; however, the 0-0 band of lycopene red shifts slower than that of í µí»½-carotene in CS2. The origins of these diversities are discussed taking into account the dispersion interactions and structures of solute and solvent molecules. It is well known that the shift of visible and ultraviolet electronic absorption spectra of chromophore in solution is related to the refractive index and the dielectric properties of solvent. The Bayliss theory, which is based on the reaction field model, shows the following relationship between the shift of the absorption band and Bayliss parameter (BP), namely, [1]