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-MEASURES [LUMINANCE]–
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-[CANDELA]-
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-[METERS]2
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(symbol: cd/m2)
the candela per square metre 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 nitēre, “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 80 cd/m2.[3]
Typically, monitors calibrated for SDR broadcast or studio color grading should have a brightness of 100 cd/m2.[4]
Most consumer desktop liquid crystal displays have luminances of 200 to 300 cd/m2.[5]
HDR displays range from around 400 to 2500 cd/m2.
Comparison with other units of luminance
[edit]
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
Units of luminance
v
t
e
cd/m2 (SI unit)
≡ nit ≡ lm/m2/sr stilb (sb) (CGS unit)
≡ cd/cm2 apostilb (asb)
≡ blondel bril skot (sk) lambert (L) foot-lambert (fL)
= 1 ⁄ π cd/ft2
1 cd/m2 = 1 10−4 π
≈ 3.142 107 π
≈ 3.142×107 103 π
≈ 3.142×103 10−4 π
≈ 3.142×10−4 0.30482 π
≈ 0.2919
1 sb = 104 1 104 π
≈ 3.142×104 1011 π
≈ 3.142×1011 107 π
≈ 3.142×107 π
≈ 3.142 30.482 π
≈ 2919
1 asb = 1 ⁄ π
≈ 0.3183 10−4 ⁄ π
≈ 3.183×10−5 1 107 103 10−4 0.30482
≈ 0.09290
1 bril = 10−7 ⁄ π
≈ 3.183×10−8 10−11 ⁄ π
≈ 3.183×10−12 10−7 1 10−4 10−11 0.30482×10−7
≈ 9.290×10−9
1 sk = 10−3 ⁄ π
≈ 3.183×10−4 10−7 ⁄ π
≈ 3.183×10−8 10−3 104 1 10−7 0.30482×10−3
≈ 9.290×10−5
1 L = 104 ⁄ π
≈ 3183 1 ⁄ π
≈ 0.3183 104 1011 107 1 0.30482×104
≈ 929.0
1 fL = 1 ⁄ 0.30482 ⁄ π
≈ 3.426 1 ⁄ 30.482 ⁄ π
≈ 3.426×10−4 1 ⁄ 0.30482
≈ 10.76 107 ⁄ 0.30482
≈ 1.076×108 103 ⁄ 0.30482
≈ 1.076×104 10−4 ⁄ 0.30482
≈ 1.076×10−3 1
Orders of magnitude (luminance)
Photometry (optics)
^ The symbols in this column denote dimensions; “L”, “T” and “J” are for length, time and luminous intensity respectively, not the symbols for the units litre, tesla and joule.
^ Standards organizations recommend that photometric quantities be denoted with a subscript “v” (for “visual”) to avoid confusion with radiometric or photon quantities. For example: USA Standard Letter Symbols for Illuminating Engineering USAS Z7.1-1967, Y10.18-1967
^ Jump up to: a b c Alternative symbols sometimes seen: W for luminous energy, P or F for luminous flux, and ρ for luminous efficacy of a source.
^ Buser, Pierre; Imbert, Michel (1992). Vision. MIT Press. p. 53. ISBN 978-0-262-02336-8. nit luminance.
^ Boyd, RLF, ed. (1992). Astronomical Photometry. Springer. p. 9. ISBN 978-0-7923-1653-4.
^ “Multimedia systems and equipment – Colour measurement and management – Part 2-1: Colour management – Default RGB colour space – sRGB”. International Electrotechnical Commission. 1999. IEC 61966-2-1.
^ “ITU-R BT.2035-7” (PDF). A reference viewing environment for evaluation of HDTV program material or completed programmes. 2013-08-13. Archived (PDF) from the original on 2022-12-20. Retrieved 2022-12-20.
^ Hung, Jonathan (May 3, 2010). “Acer Ferrari One 200 Review – More than a Netbook”. PC Perspective. Retrieved 2018-01-21.
^ Cohen, Steven. “What is HDR? High dynamic range TVs and formats, explained”. Business Insider. Retrieved 2024-05-08.
IEC 61966-2-1:1999 Multimedia systems and equipment – Colour measurement and management – Part 2-1: Colour management – Default RGB colour space – sRGB
IEC International System of Units zone
en.wikipedia.org /wiki/Candela_per_square_metre
Candela per square metre
Contributors to Wikimedia projects4-5 minutes 8/21/2002
From Wikipedia, the free encyclopedia
(Redirected from Nit (unit))
“Nit (unit)” redirects here. For the unit of information entropy, see Nat (unit).
Candela per square metre
Unit system SI
Unit of luminance
Symbol cd/m2
In SI base units: cd·m−2
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