Illuminance

Updated: 10/01/2023 by Computer Hope

Illuminance is the measurement of light illuminating a surface. The scientific unit for measuring illuminance is called a lux (lx). Below are examples of different illuminance levels under different lighting conditions.

Examples levels of illuminance

Lighting condition Candles Lux
Sunlight 10,000 107,527
Full daylight 1,000 10,752
Overcast day 100 1,075
Very dark day 10 107
Twilight 1 10.8
Deep twilight 0.1 1.08
Full moon 0.01 0.108
Quarter moon 0.001 0.0108
Starlight 0.0001 0.0011
Overcast night 0.00001 0.0001

Brightness, Candle, Lumen, Lux, Video terms