Luminance in Illumination Formulas

Luminance refers to the amount of light emitted, reflected, or transmitted by a surface or object per unit area. It measures the brightness or intensity of the light perceived by an observer. And is denoted by L_v. Luminance is usually measured using the Candela Steradian per Sq Meter for Illuminance. Note that the value of Luminance is always negative.

Formulas to find Luminance in Illumination

fxInverse Square LawGo

fxLuminanceGo

fxLuminance for Lambertian SurfacesGo

List of variables in Illumination formulas

fx Intensity of Transmitted Light Go

fx Distance Go

fx Luminous Intensity Go

fx Area of Illumination Go

fx Illumination Angle Go

fx Illumination Intensity Go

FAQ

What is the Luminance?

Luminance refers to the amount of light emitted, reflected, or transmitted by a surface or object per unit area. It measures the brightness or intensity of the light perceived by an observer. Luminance is usually measured using the Candela Steradian per Sq Meter for Illuminance. Note that the value of Luminance is always negative.

Can the Luminance be negative?

Yes, the Luminance, measured in Illuminance can be negative.

What unit is used to measure Luminance?

Luminance is usually measured using the Candela Steradian per Sq Meter[cd*sr/m²] for Illuminance. Lux[cd*sr/m²] are the few other units in which Luminance can be measured.

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