First we must find out what the sense organ is actually related to — not wavelength, but changes in the light, not shape as such but constant ratio proportions, not
mean molecular kinetic energy but heat loss and heat gain from the organism itself.
If the question specified, e.g. relation to
the molecular kinetic energy, then Kelvin scale (which has meaningful zero point in this case) would have been appropriate to calculate the ratio.
Paul Birch: «What they explicitly say is that the assumption that «temperature is proportional to average
molecular kinetic energy» is FALSE (for the finite microcanonical ensemble).
They explicitly state: «In... a finite system... the conclusion in statement (2b) is wrong...», where statement (2b) is «Temperature is proportional to the average
molecular kinetic energy».