Candela per square meter (cd/m²):
Definition: Luminance in SI is the quantity of light emitted from a surface in a given direction per square meter. It measures the intensity of light per unit area.
Application Area: This quantity is mainly used for describing the brightness of screens, monitors, lighting fixtures, and other light-emitting surfaces.
Nit (nit):
Description: Non-SI unit, candela per square meter (cd/m²). It is used to measure the luminance of the display screen or light source.
Application : Generally used in industry for display devices such as TVs, computer monitors, and mobile phones, to show brightness of the screen.
Candela per square foot (cd/ft²):
Description : Measures luminance in terms of candela per square foot, gives a unit of brightness per area on square foot.
Use Case: It is chiefly utilized in the US in lighting applications like photography and screen calibration.
Lambert (L):
No one with a knowledge of the topic needs to explain what a Lambert is. Essentially,
Definition: Unit of luminance equal to 1/π candela per square centimeter or around 3183 cd/m². It is intended to measure the brightness of light reflected off surfaces.
Use Case: Scientific measurement and industries that assess reflective brightness, among them optics and material science.
Millilambert (mL):
Description: It is a unit of lambert, which refers to one-thousandth of a lambert. Its measurement uses lower luminance levels mainly for scientific and accurate applications.
Use Case: This is applied mainly in applications requiring luminance measurement in a high definition requirement that starts with laboratory applications and subtle research on light.
Foot-lambert (fL):
Description: This is the unit of luminance measuring the brightness of a surface reflecting or emitting light. It is also expressed in terms of 1/(π) candela per square foot or approximately 3.426 cd/m2.
Application: Widespread in the USA for standardizing the projection of movie screens, screen brightness, and many other visual presentations.
Stilb (sb)
Definition: A luminance unit of measure in cgs (centimeter-gram-second) equivalent to 10,000 candelas per square meter. Measures extremely high brightness.
Application: Was once used for scientific applications. Especially in much older literature on light intensities and luminance measurement.
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