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

is a unit of luminance (photometric brightness).


  • To use , you first need to load the Units Package using Needs["Units`"].
  • is equivalent to Candela/(Meter2 Pi) (SI units).
  • is equivalent to 10-4 Lambert.
  • Convert[n Apostilb,newunits] converts n Apostilb to a form involving units newunits.
  • is typically abbreviated as asb.
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