I have known the value of solar irradiance in 817nm band is 1.08279
W/(m2*nm).How can I define it?  "light_source {<sun_x,sun_y,sun_z> color rgb
1.08279 } "I set statement as above in pov,but I doublt it is wrong,because
1.08279 is a solar irradiance,color rgb is color ，but I donnot know how
to convert them or how to define solar irradiance.beg a hot to help me !thank
you!

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