As of Version 9.0, unit functionality is built into the Wolfram Language

is a unit of luminous energy (quantity of light).


  • To use , you first need to load the Units Package using Needs["Units`"].
  • is equivalent to Lumen Second (SI units).
  • is equivalent to Talbot.
  • Convert[n Lumerg,newunits] converts n Lumerg to a form involving units newunits.
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