Luminous flux
From Biocrawler, the free encyclopedia.
Luminous flux is a measure of the energy emitted by a light source in all directions.
The SI unit of Luminous flux is the lumen (lm).
One lumen is defined as the amount of light that falls on a unit spherical area at unit distance from a light source of one candela.
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SI light units
| SI light units edit (http://www.biocrawler.com/w/index.php?title=Template:SI_light_units&action=edit) | ||||
|---|---|---|---|---|
| Quantity | SI unit | Symbol | Notes | |
| Luminous energy | lumen seconds | lm · s | lumen seconds are sometimes called Talbots | |
| Luminous flux | lumen or (candela · steradian) | lm | also called Luminous power | |
| Luminous intensity | candela or (lumen / steradian) | cd | ||
| Luminance | candela / square metre | cd/m2 | also called Luminosity | |
| Illuminance | lux or (lumen / square metre) | lx | ||
| Luminous efficiency | lumens per watt | lm/W | ||
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