"CAS" <sup### [at] cstnetcn> wrote:
> I have another confusion:I have known the value of solar irradiance(w/m^2) from
> 200nm-2200nm,how can I set the solar irradiance in pov?

It is not exactly clear what you are trying to do, but my best guess would be
that you are trying to match POV-Ray output with some physical measurements that
you got somewhere. That is something POV-Ray light models (or that of most
general purpose 3D programs) are not designed to do. You may get much better
results using Radiance (http://radsite.lbl.gov/radiance/HOME.html) or
special-purpose wave-model based ray-tracers.

Thorsten

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