Photoluminescence spectra of single and coupled double wells were reanalyzed assuming a 62% partition of the band‐gap discontinuity to the conduction band and an energy‐dependent light‐hole effective mass. The photoluminescence peak positions of the single well are little affected when 62% instead of 85% is adopted for the partition value. The photoluminescence spectra of the coupled wells consist of a main peak and its satellites. Energy differences between the peak and its satellites are in good agreement with the calculated values when they are ascribed to transitions between doublet states in the conduction‐band well and doublet states in the valence‐band well, assuming a 62% partition and reasonable energy dependence of the light‐hole mass. This coupled double well offers a first evidence for the energy‐dependent light‐hole mass.