Ya, "illuminated" by that bright shiny layer of the sun!
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By design, our human eyes evolved *BECAUSE OF* the light from that surface. There isn't any structure in nature more turned, and more designed to observe that bright surface than our eyes and our brains. The wavelength in question falls into the visible spectrum of our human eyes. That surface is the "external light source" that eyes evolved to be able to observe from the moment eyes began to evolve in the very first creatures on Earth.
Our eyes didn't evolve based on a light source on Earth, but from the very surface we're looking at in the visible spectrum in gband images.
http://www.thesurfaceofthesun.com/images/gband_pd_15Jul2002_short_wholeFOV-2.mpg
Our human eyes, and our human brains have "evolved" *because of" that surface. There are no better tools in this solar system with which to study that layer than our human eyes and our human brains.
Really?
So you can measure wavelengths and emission "energies" with your eyes?
You are a better scientist than I then...
Can you demonstrate the blackbody nature of the "light" using human eyes only?
What is it exactly you are getting at here? I dont see your point...