Luminous flux
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Luminous flux is the amount of light that falls on a unit area at unit distance from a source of one candela.
In SI units, it is measured in lumen.
SI light units
| Quantity | SI unit | Symbol | Notes | |
|---|---|---|---|---|
| Luminous energy | joule | J | ||
| Luminous flux | lumen or ( candela · steradian ) | lm | also called Luminous power | |
| Luminous intensity | candela | cd | ||
| Luminance | candela / square metre | cd/m2 | also called Luminosity | |
| Illuminance | lux or (lumen / square metre) | lx | ||
| Luminous efficacy | lumens per watt | lm/w | ||
de:Lichtstrom
