Luminance vs. Illuminance

Though the terms sound suspiciously similar, there are some distinct differences

Luminance:

In short, luminance refers to the amount of light emitted by a surface or object and is often used interchangeably with the term brightness. Brightness and luminance are not the same, however, as brightness is the visual sensation by which we perceive differences in luminance. Luminance is a quantifiable and measurable characteristic that can …