The luminosity value. 
   Namespace:   Autodesk.Revit.DB.Lighting  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
  Since:  2013 
Syntax
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Field Value
The luminosity value in cd as a numerical value between 0 and 1e+30.Exceptions
| Exception | Condition | 
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| Autodesk.Revit.Exceptions ArgumentOutOfRangeException | When setting this property: The luminosity value is not valid because it is not between 0 and 1e+30. |