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.
This display has high luminance.
This display has high brightness, so it's easy to see even outdoors.
The unit of luminance is candela per square meter.
I raised the screen's brightness to make it easier to see.
We measured the luminance with specialized equipment.
照度 measures the amount of light falling on a surface (illuminance, in lux), while 輝度 measures the light emitted or reflected from a surface (luminance, in cd/m²), so learners often mix the two up.
Compound of 輝 (ki, 'shine') and 度 (do, 'degree'), a modern technical coinage for 'luminance'.