ഫലകം:SI light units
| അളവ്കോൽ | സൂചകം[nb 1] | അന്താരാഷ്ട്ര ഏകകം | ഏകക സൂചകം | ഡയമെൻഷൻ | കുറിപ്പുകൾ | |||
|---|---|---|---|---|---|---|---|---|
| Luminous energy | Qv [nb 2] | lumen second | lm⋅s | T⋅J [nb 3] | units are sometimes called talbots | |||
| പ്രകാശപ്രവാഹം(Luminous flux) | Φv [nb 2] | lumen (= cd⋅sr) | lm | J | also called luminous power | |||
| പ്രകാശതീവ്രത(Luminous intensity) | Iv | candela (= lm/sr) | cd | J | an SI base unit, luminous flux per unit solid angle | |||
| Luminance | Lv | candela per square metre | cd/m2 | L−2⋅J | units are sometimes called nits | |||
| Illuminance | Ev | lux (= lm/m2) | lx | L−2⋅J | used for light incident on a surface | |||
| Luminous emittance | Mv | lux (= lm/m2) | lx | L−2⋅J | used for light emitted from a surface | |||
| Luminous exposure | Hv | lux second | lx⋅s | L−2⋅T⋅J | ||||
| Luminous energy density | ωv | lumen second per metre3 | 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 | |||
| Luminous efficiency | V | 1 | also called luminous coefficient | |||||
| 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.
- ↑ 2.0 2.1 2.2 Alternative symbols sometimes seen: W for luminous energy, P or F for luminous flux, and ρ or K for luminous efficacy.
- ↑ "J" is the recommended symbol for the dimension of luminous intensity in the International System of Units.