Luminance is the measure of the amount of light that is emitted, passed through, or reflected from a particular area, in a specific direction. The unit of measurement for luminance is the **nit** (symbol: **nt**), which is defined as one candela per square meter (cd/m²).
An apostilb is a unit of measurement for luminous intensity, specifically in photometry. It is defined as equivalent to one lumen per steradian. The term "apostilb" can sometimes be seen as a non-SI (International System of Units) unit, and its use is less common compared to other measurements like the candela, which is the standard unit of luminous intensity in the SI system.
The bríl (symbol: Br) is a derived unit of measurement for brightness in the context of visual perception. It quantifies how bright a light source appears to the human eye, taking into account both the intensity of the light and the response of the human visual system. The unit was proposed to provide a standardized way to express brightness in various applications, such as lighting design, photography, and display technology.
Candela per square metre (cd/m²), commonly referred to as "nits," is a unit of measurement for luminance. It quantifies the amount of light that is emitted from a surface in a particular direction. Specifically, one candela per square metre is equivalent to one candela (the SI unit of luminous intensity) spread uniformly over a square meter of area.
Foot-lambert (abbreviated as ft-L) is a unit of measurement used to quantify luminance, which is the amount of light that is emitted, transmitted, or reflected from a surface in a specific direction. Specifically, it is defined as the luminance of a surface that emits or reflects one lumen per square foot. In different contexts, luminance is an important measure for assessing how bright a surface will appear to the human eye under various lighting conditions.
The skot is a unit of measurement of electric current that was historically used in certain regions, particularly within Russia and some adjacent countries. It is equal to 1 ampere. However, it is not widely used or recognized today, with the standard unit of electric current being the ampere, as defined by the International System of Units (SI). The skot may appear in older texts or regional contexts but has been largely replaced by more universally accepted units in contemporary scientific and engineering disciplines.
The stilb is a unit of luminous intensity, specifically used in photometry to quantify the brightness of a surface in a particular direction. It is defined as the luminous intensity of a surface that emits light uniformly in all directions, with a luminous flux of one lumen per square meter. The unit is named after the Greek word "stilbos," which means "brightness" or "shine.
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