光こう束そく

noun

luminous flux

Physics term for the total amount of visible light emitted by a source per unit time, measured in lumens.

• LEDの光こう束そくはルーメンで表あらわされる。

  The luminous flux of an LED is expressed in lumens.

noun

beam of light; pencil of light

General term for a narrow, directed stream of light, such as a searchlight beam or a shaft of sunlight.

• 雲くもの切きれ間まから光こう束そくが差さし込こんだ。

  A beam of light shone through a break in the clouds.