光こう度ど

noun

luminous intensity; light intensity

Technical term used in physics and lighting; also used more generally for the brightness of a light source.

• この電でん球きゅうの光こう度どは800ルーメンです。

  The luminous intensity of this light bulb is 800 lumens.

• 光こう度どを測そく定ていする装そう置ちを光こう度ど計けいという。

  A device that measures light intensity is called a photometer.