 Equal radiant power under visual weighting

An original declared model makes the distinction visible without substituting invented numbers for the photopic luminous efficiency function. Define a triangular weightThis $w$ is an illustrative function, not a fit or table of $V$. Three ideal spectral lines, each carrying radiant flux $1\mathrm{mW}$, at $450$, $555$ and $650\mathrm{nm}$ have weights $3/10$, $1$ and $11/30$. Their model weighted outputs are respectively $0.2049$, $0.6830$ and approximately $0.25043\mathrm{lm}$. These are model calculations, not standard luminous fluxes or measured data. For mixtures of these lines the model outputs add, just as the integral adds independent spectral contributions.