cast light on vs floodlight

cast light on

floodlight

verb
  • To enlighten or illuminate with floodlight(s). 

noun
  • Powerful artificial illumination with a broad beam, especially in a series of units on pylons used to illuminate a sports ground. 

  • A projector of a bright beam of light for use in theatres and studios; a flood 

How often have the words cast light on and floodlight occurred in a corpus of books? (source: Google Ngram Viewer )