[Radiance-general] Radiance's optics

[Greg Ward]

The RGB channels in Radiance can be interpreted however you like.  By default, they are interpreted as visible components, but if you change the emissions, reflectances, etc. to stand for different channels, that's what you'll get.  Math is math.

-Greg

> From: "Guglielmetti, Robert" <Robert.Guglielmetti at nrel.gov>
> Date: November 28, 2012 6:54:52 PM HST
> 
> Hi Germán,
> 
> When the software is left to its own devices, it is considering beyond the visible range. You can get radiance and irradiance, and this is the default output. Radiance (the software) is often used for estimating solar resource for PV; applying V-lambda is always a second step that is available, in order to weight the radiometric values to photometric values (luminance or illuminance). I don't do much with radiometric values, but we would like to do more of that in OpenStudio. 
> 
> Perhaps some others can weigh on with their experience looking beyond visual range. 
> 
> - Rob
> 
> ________________________________________
> From: Germán Molina Larrain [gmolina1 at uc.cl]
> Sent: Wednesday, November 28, 2012 1:26 PM
> 
> Thanks for the quick response Bob!
> 
> It is a little bit clearer now, But. the radiance considered by the software is, then, only the visible part of  the sun's radiance? If I wanted to compute the total solar radiation (including IR and UV). Should I compute (,265*R+.67*...)/vf ; where "vf" is the visible fraction of the solar spectrum?
> 
> 
> Thanks Very much!