[Radiance-general] getting irradiance from source defined in photometric units

[Lars O. Grobe]

Hi Ignacio!

Thanks for the quick reply! Just to avoid misunderstandings, the -s 
parameter in falsecolor does not change the radiometric values but the 
scale that is applied to them in the resulting image (as this is a 
one-way, this does not reallt matter). So with -s, you define the range 
of pixel values that will mapped to the color scale. The multiplier is 
given following -m, and the default (to get from radiometric to 
photometric according to the internal efficacy of 153 lm/W that is used 
by Radiance) is -m 153. So that is why I was wondering whether giving -m 
1 would be enough.

My main concern is at the moment whether the HMI-source photometry is 
correctly transfered into radiometry by only using ies2rad with the 
lamptab (unfortunately I do not have more detailed information on the 
emission spectrum and luminous efficacy).

Cheers, Lars.