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Candela per square metre

SI derived unit of luminance

SI derived unit of luminance

FieldValue
namecandela per square metre
standardSI
quantityluminance
symbolcd/m2
extralabelIn SI base units:
extradatacd·m−2

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

The nit (symbol: nt) is a deprecated non-SI name also used for this unit (1 nt = 1 cd/m2). The term nit is believed to come from the Latin word , "to shine".

As a measure of light emitted per unit area, this unit is frequently used to specify the brightness of a display device. The sRGB spec for monitors targets . Typically, monitors calibrated for SDR broadcast or studio color grading should have a brightness of . Most consumer desktop liquid crystal displays have luminances of 200 to 300 cd/m2. HDR displays range from around 400 to 2500 cd/m2.

Comparison with other units of luminance

One candela per square metre is equal to:

  • 10−4 stilbs (the CGS unit of luminance)
  • π × 10−4 lamberts
  • π apostilbs
  • 0.292 foot-lamberts
  • π × 103 skots
  • π × 107 brils
  • 1 nit

References

References

  1. (1992). "Vision". MIT Press.
  2. (1992). "Astronomical Photometry". Springer.
  3. (1999). "Multimedia systems and equipment – Colour measurement and management – Part 2-1: Colour management – Default RGB colour space – sRGB". [[International Electrotechnical Commission]].
  4. (2013-08-13). "ITU-R BT.2035-7".
  5. Hung, Jonathan. (May 3, 2010). "Acer Ferrari One 200 Review – More than a Netbook". PC Perspective.
  6. Cohen, Steven. "What is HDR? High dynamic range TVs and formats, explained".
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This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

units-of-luminance si-derived-units area-specific-quantities
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