headlamp vs incandescence

headlamp

noun
  • An individual headlight, particularly of a motor vehicle. 

  • A flashlight worn on the head. 

incandescence

noun
  • the light so emitted 

  • the emission of visible light by a hot body 

  • great emotion, especially anger 

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