> The 1.33015 figure is got from Solar_irradiance_Thuillier_2002,whcih measured by
> instrument.It has the solar irradiance from 199nm to 2397nm.My test is single
> wavelength first,then many wavelengths.My lightsource I used is a single
> wavelength and the reflectivity of object is also a single wavelength . My major
> is remote sensing.What I want to do is simulting  radiance .With the help of
> pov,I have got luminance when I set openexr output.I have converted irradiance
> to illuminance ,the illuminance in 730nm is 0.355*1.33015=0.47220325.I set
> "SpectralEmission(0.47220325)".The result is luminance.Maybe I was wrong
> ,because the luminance pov got is  much larger than my real lumiance.I am
> confusing.

Try the example below:

//--
#version 3.7
global_settings {assumed_gamma 1}
#default{ finish{ ambient 0.0 diffuse 1.0 }}

camera
{
  orthographic
  location z
  look_at  0
  right    x*image_width/image_height
}

light_source{ <0,0,10> color rgb 1 }

box { -1/2 1/2 pigment{ color rgb 0.5 } }
//--

What pixel value do you get in the output image? Is it what you expect?

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