Skot (unit)
Skot (symbol: sk) is an old and deprecated measurement unit of luminance, used for self-luminous objects (dark luminance).
Unit conversions
One skot is equal to:
- candela per square metre
- 10−7 lamberts
- 10−3 apostilbs
- 104 brils
- stilbs (candela per square centimetre)
- about 0.0000929 foot-lamberts
See also
Quantity | Unit | Dimension | Notes | |||||
---|---|---|---|---|---|---|---|---|
Name | Symbol[nb 1] | Name | Symbol | Symbol | ||||
Luminous energy | Qv [nb 2] | lumen second | lm⋅s | T⋅J [nb 3] | Units are sometimes called talbots. | |||
Luminous flux / luminous power | Φv [nb 2] | lumen (= cd⋅sr) | lm | J [nb 3] | Luminous energy per unit time. | |||
Luminous intensity | Iv | candela (= lm/sr) | cd | J [nb 3] | Luminous power per unit solid angle. | |||
Luminance | Lv | candela per square metre | cd/m2 | L−2⋅J | Luminous power per unit solid angle per unit projected source area. Units are sometimes called nits. | |||
Illuminance | Ev | lux (= lm/m2) | lx | L−2⋅J | Luminous power incident on a surface. | |||
Luminous exitance / luminous emittance | Mv | lux | lx | L−2⋅J | Luminous power emitted from a surface. | |||
Luminous exposure | Hv | lux second | lx⋅s | L−2⋅T⋅J | ||||
Luminous energy density | ωv | lumen second per cubic metre | lm⋅s⋅m−3 | L−3⋅T⋅J | ||||
Luminous efficacy | η [nb 2] | lumen per watt | lm/W | M−1⋅L−2⋅T3⋅J | Ratio of luminous flux to radiant flux or power consumption, depending on context. | |||
Luminous efficiency / luminous coefficient | V | 1 | ||||||
See also: SI · Photometry · Radiometry |
- ↑ Standards organizations recommend that photometric quantities be denoted with a suffix "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
- 1 2 3 Alternative symbols sometimes seen: W for luminous energy, P or F for luminous flux, and ρ or K for luminous efficacy.
- 1 2 3 "J" here is the symbol for the dimension of luminous intensity, not the symbol for the unit joules.
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