Here is the gist. An electron is a blackbody cavity, that is why the night sky is dark. Also, the 5f6 of 231PU is a blackbody cavity. Now, you put something into that cavity that is hot. And you will see a color.
Photosynthesis is hot, is a burning.
Photosynthesis is the reverse burning of hydrogen. Photosynthesis is chlorophyll. You see, I know chlorophyll is green and can look up its chemistry as well as anyone else. But I can increase this enquiry to the fact of the visible spectrum of light. Well , if we are the most advanced life, the blackbody cavity of 5f6 of 231Pu would select a bandwidth that is the most useful to intelligent life and still be in the range of the color of green photosynthesis.