Perhaps you could share more context here? Choosing a communication method will depend on what you’re trying to achieve.
- does every lamp have its own widget button?
- how does the user choose which lamp to switch with the button?
- or do you literally have 1 lamp and 1 button and that’s it?
It would also help if you told us where you create the widget and how the lamp ended up in the scene - did you drag an actor with a point light into the scene from the Content Browser?