By Adam Nagy
Just like in case of many other styles, first you need to find the given style inside the appropriate styles collection - in this case LightingStyles. Then you assign that to the settings parameter - in this case the ActiveLightingStyle property of the Document.
Sub ChangeLightingStyle()
Dim doc As Document
Set doc = ThisApplication.ActiveDocument
Dim lss As LightingStyles
Set lss = doc.LightingStyles' Let's just use the first style' InternalName: "1:Cool Light"
doc.ActiveLightingStyle = lss("1:Cool Light")
End SubCode in action: