candleholder vs light fixture

candleholder

noun
  • A device for holding one or more lit candles 

  • A person who holds a candle to assist another person who is working in dim light. 

light fixture

noun
  • A complete lighting unit, composed of a housing attached to a wall or ceiling, and a mount for a light source. 

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