FED vs radiance

FED

noun
  • Field emission display. 

name
  • Federal Reserve System. Alternative spelling of Fed 

radiance

noun
  • The flux of radiation emitted per unit solid angle in a given direction by a unit area of a source. 

  • The quality of being radiant, shining, bright or splendid. 

How often have the words FED and radiance occurred in a corpus of books? (source: Google Ngram Viewer )