noun
- the amount of light falling on a surface, measured in lux
Usage: technical; physics
Examples
- The illuminance in the office was measured at 500 lux.
- Proper illuminance is essential for reading without eye strain.
- The photographer adjusted the lighting to achieve optimal illuminance.
- Building codes specify minimum illuminance levels for workspaces.
- Scientists use light meters to measure illuminance accurately.
- The illuminance decreased significantly as clouds covered the sun.