illuminance

Illuminance is a measure of how much light is hitting a specific area, usually expressed in lux or foot-candles. Think of it as the brightness level that a surface receives from a light source. For example, a well-lit office has higher illuminance than a dimly lit restaurant. It helps evaluate whether a space has enough light for activities like reading or working without being too harsh or too dim. Essentially, illuminance relates to how bright a surface appears due to the light falling on it, ensuring environments are safe and suitable for their intended use.