光こう源げん

noun

light source

General term for anything that emits light, from lamps to the sun. Used in technical and everyday contexts.

• この部屋へやには光こう源げんが足たりない。

  This room doesn't have enough light sources.

• 太たい陽ようは地ち球きゅう上じょうで最もっとも重じゅう要ような光こう源げんだ。

  The sun is the most important light source on Earth.