OBSOLETE UNITS PACKAGE SYMBOL
As of Version 9.0, unit functionality is built into the Wolfram Language
is the derived CGS unit of illumination (illuminance).
- To use , you first need to load the Units Package using Needs["Units`"].
- is equivalent to 10000 Lux (SI units).
- Convert[n Phot,newunits] converts n Phot to a form involving units newunits.
- is typically abbreviated as ph.