The illuminance intensity value. 
Namespace: Autodesk.Revit.DB.Lighting
Assembly: RevitAPI (in RevitAPI.dll) Version: 24.0.0.0 (24.0.0.0)
Since:  2013 
Syntax
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Field Value
The illuminance value in lx as a numerical value between 0 and 1e+30.Exceptions
| Exception | Condition | 
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| Autodesk.Revit.ExceptionsArgumentOutOfRangeException | When setting this property: The illuminance value is not valid because it is not between 0 and 1e+30. |