A new model for mesopic spectral sensitivity curves is realised, using the colorimetric method. Trichromatic colour matches to five monochromatic stimuli are made within the mesopic range of vision at various levels of power using monochromatic primaries. The proposed model is a linear combination of the V10(λ) and V'(λ) standard spectral sensitivity curves and is characterised by a coefficient depending on radiance. The values of this coefficient are first estimated from the colorimetric results using the least squares method. Then, they are fine tuned by an optimisation procedure. This model gives comparable results to other models based on visual performance.
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