What is luminance cd m2?

The candela per square metre (symbol: cd/m2) is the derived SI unit of luminance. The unit is based on the candela, the SI unit of luminous intensity, and the square metre, the SI unit of area.

How many cd m2 is the sun?

The sun has a luminance of about 1.6×109 cd/m2 at noon.

Is luminance and brightness the same?

Because luminance and illuminance are quantifiable, they are not interchangeable with brightness. Luminance is the measurable quality of light that most closely corresponds to brightness, which we cannot objectively measure.

How luminance is measured?

4. Luminance – Measured in candela per square meter or nit, luminance is the total light emitted or reflected from a surface in a given direction. It indicates how bright we perceive the result of the interaction of the incident light and the surface.

What is the luminous flux formula?

Illuminance is the Luminous Flux per unit area of incident radiation away from the light source. (unit:Lux,lx) Illuminance can be considered the Flux within one square meter. lx = lm/ m2.

What is a luminance meter?

Spot luminance meters are used for measuring the “brightness” and colour of a defined area (or ‘spot’) on a display, sign or other light source. Luminance is measured in units of candelas per square meter (cd/m2), or nits for our American friends.

What do you mean by luminance?

1 : the quality or state of being luminous. 2 : the luminous intensity of a surface in a given direction per unit of projected area.

What is luminance in lighting design?

Luminance is the density of luminous intensity in a given direction and falls within a given solid angle. It is measured in cd/m2 or nits. Luminance is often used to characterize the emission from a diffuse surface.

What is a good cd m2?

Typical brightness ratings range from 250 to 350 cd/m2 for monitors that perform general-purpose tasks. For displaying movies, a brighter luminance rating such as 500 cd/m2 is desirable.

What is cd m2 vs nits?

cd/m2 represents candela per meter squared. Candela is a very old brightness metric that is based on “whale oil candles.” 1 Candela is the light emitted by one such candle, which were “standard” at the time. NIT is a metric for measuring luminance, which is how much light an object emits.

Why is cd 120 m2?

Ambient lighting level deviations mostly affect on shadows perception so you have to adjust display black point and/or gamma. 120 cd/m2 is enough for 80-200 lux but is not suitable for daylight in general. Excessive brightness is harmful for eyes and is needed only to provide necessary contrast/dynamic range.