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a simple question about radiometry.

I consider a diffuse (Lambertian) emitter which has the shape of a square planar surface, with areaA, parallel to the horizontal xy-plane, and centered at the point (0,0,h).

I know the radiant flux at each point of the emitter [itex]\Phi(x,y,z,\Theta)=\mathrm{const}[/itex]

What should I do to compute theirradianceat the location (0,0,0) of the surface represented by the xy-plane?

Thanks!

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# Consider a diffuse (Lambertian) emitter

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