|Unit name||Lumen second|
|Physical quantity (s)||Amount of light|
|system||International system of units|
|In SI units|
|Derived from||Lumens , second|
Lumen second ( unit symbol lms ) is the SI unit of the amount of light . The amount of light is calculated as the integral of a luminous flux (SI unit lumen ) over time (SI unit second ); accordingly, its SI unit is the product of lumen and second:
The unit is also called Talbot (after William Henry Fox Talbot ) or Lumberg , but these special names are not accepted by the organs of the International Meter Convention for use with SI units, nor are legal units in the EU in metrology .
In practice, the lumen-hour (lmh) is often used as a measure, which is the amount of one lumen over an hour.