noun
brightness; luminance
Technical term for the perceived brightness of a surface or light source, measured in cd/m². Used in physics, display technology, and lighting.
このディスプレイは輝度が高いので、屋外でも見やすい。
This display has high brightness, so it's easy to see even outdoors.
輝度の単位はカンデラ毎平方メートルです。
The unit of luminance is candela per square meter.