Creates a light family object from the given family document 
   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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Parameters
- document
-  Type:  Autodesk.Revit.DB Document  
 The family document
Return Value
The newly created LightFamily objectExceptions
| Exception | Condition | 
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| Autodesk.Revit.Exceptions ArgumentException | The Document is the argument that is being validated The document is not valid because it is not a light family document. | 
| Autodesk.Revit.Exceptions ArgumentNullException | A non-optional argument was NULL |