Illuminance refers to the measurement of the amount of light that falls on a surface. It is a crucial parameter in lighting design and photography, as it determines the brightness and visibility of objects in a given space.

Common units used to measure illuminance include lux, foot-candles, and lumens per square meter. Lux is the international unit of illuminance, while foot-candles are commonly used in the United States. Lumens per square meter is another metric unit used to quantify illuminance.

• Illuminance is essential in designing effective lighting systems for buildings and outdoor spaces.
• It helps determine the visibility and clarity of objects in photographs and videos.
• Proper illuminance levels are crucial in ensuring safety and comfort in work environments.