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In [[photometry (optics)|photometry]], the '''lumen second''' ('''lm ⋅ s''') is the [[SI derived unit]] of [[luminous energy]]. It is based on the [[lumen (unit)|lumen]], the SI unit of [[luminous flux]], and the [[second]], the [[SI base unit]] of time.
The lumen second is sometimes called the '''talbot''' (symbol '''T'''). This name was coined in 1937 by the Committee on Colorimetry, [[Optical Society of America]], in honor of the early [[photographer]] [[William Fox Talbot]].<ref name="Loyd_1937_Nomenclature" /> The talbot is exactly equal to the lumen second:
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