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

[Ignacio Munarriz]

Lars,
falsecolor default output are nits 1 cd/m2 or lux lm/m2 if you have used 
-i in rpict , so if you use -l W/m2   only change the legend, imo, you 
would use -s 1 to change the default multiplier from 179, or use "Lux" 
as legend, although you've introduced the data as cd, radiance makes the 
conversion in ies2rad to W and then again to cd or lm in falsecolor, 
anyway i would use lux rather than irradiance as output, because with 
W/m2 you are considering a Luminous efficacy conversion

regards,
Ignacio

Lars O. Grobe escribió:
> Hi,
>
> I am trying to get the irradiance [W/m2] on an object surface by a HMI 
> source with a known cd-distribution which I was able to get from a 
> plot (I read the values [cd] from the polar plot, made a IES-formatted 
> luminaire description of it and converted this using ies2rad). I had 
> put "metal halide" into the [LAMP]-line of the ies, in the hope that 
> radiance would match the HMI-type then.
>
> Now I am wondering how to interpret the results. In general, I would 
> assume the results of a Radiance simulation to be in W/m2, and the 
> conversion to happen at the beginning, so in the lamp.tab-look-up by 
> ies2rad in my case. So am I correct using the results without further 
> conversion, and having -m 1 -l W/m2 as falsecolor's parameters?
>
> Thank you, cheers
>
> Lars.
>
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