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

[Jack de Valpine]

Isn't the internal efficacy 179?

-Jack

Ignacio Munarriz wrote:
> Oh Sorry!!, i had mixed the -s and -m parameter in the falsecolor man 
> page, the lamp color conversion from cie to rgb will affect the 
> radiance output (scaled by the color) , but I don't know how that can 
> be interpreted,
> regards, ignacio
>
> Lars O. Grobe escribió:
>> 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.
>>
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>
>
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