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Can't Set UProperty in C++, Why?

I'm trying to change the properties of any object through the TFieldIterator ..

Running my code with Begin Play I can actually print on the screen the value of some property, then change it and print property value modified .. . nothing else happens to the object after the value has been changed ...

I'm trying to change the intensity of a lamp .. the code seems to work and when I get the properties of the lamp returns the value that has been modified over the lamp not changes in intensity ... why?

 void UIllusionToolkit::SetFloats(UObject* Object, FName PropertyName, float PropertyValue)
     UProperty* Property = Object->GetClass()->FindPropertyByName(PropertyName);
     if (UNumericProperty *NumericProperty = Cast<UNumericProperty>(Property))
         if (UFloatProperty *FloatProperty = Cast<UFloatProperty>(NumericProperty))
             void* ValuePtr = FloatProperty->ContainerPtrToValuePtr<void>(Object);
             FloatProperty->SetFloatingPointPropertyValue(ValuePtr, PropertyValue);

Product Version: UE 4.9 Preview
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asked Aug 20 '15 at 06:06 PM in C++ Programming

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