light_source {<sun_x,sun_y,sun_z>
             SpectralEmission(E_D80)
             }
My solar irradiance in 730nm is 1.33015.I should use E_D50 or E_D65 or
E_D93.Should I choose which one is my need ?Help!
http://en.wikipedia.org/wiki/Standard_illuminant#Illuminant_series_D

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