Lighting a lamp with a widget

Good morning Everynone,

I am aware that I am leaving you in the interrogation, so I will try to enlighten you as best I can.
I engaged in a small learning exercise, to understand simple principles, the goal being to master the inputs and outputs of variables in the Bleuprint.
For the moment I have placed three lamps and three buttons that are used to turn these lamps on and off, plus a fourth button that displays a number. All this in an inventory Widget.

Here is the montage in pictures: