Comparison of the distribution of the integrated bolometric light-curve luminosity E_rad of observed Type IIn supernovae (top) and the conversion efficiency f_M from our models (bottom). The data from Hiramatsu et al. (2024) distinguish between a high-luminosity group (E_rad ∼ 1.8 × 10⁵⁰ erg, blue) and a low-luminosity group (E_rad ∼ 1.4 × 10⁴⁹ erg, orange), while that of Ransome & Villar (2025) is derived via MOSFIT by fitting and integrating the bolometric light curve for each transient until day 200 after the explosion. The data from Ransome & Villar (2025) were normalized to the total number of transients they analyzed.