noun
- the SI unit of illumination, equal to one lumen per square meter
Usage: technical; physics
Examples
- The office lighting measured 500 lux at desk level.
- Full sunlight provides about 100,000 lux of illumination.
- The photographer used a light meter to measure lux values.
- Reading requires at least 200 lux for comfortable vision.
- The museum maintains lighting at 150 lux to protect artwork.