Illuminance vs Luminance

It is sometimes worthwhile to understand how various metrics related to the measurement of light intensity work. Two of them are illuminance and luminance. They can sound really mundaneĀ and fool the subject into believing that both are actually the same thing. However, they are not. As a matter of fact, they are quite different.

Illuminance is the measure of light incident on a surface. Whereas, luminance is a measure of light that is either reflected or emitted by a body, such as glass, road, sun, moon or stars.

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