Well Jay R your pretty much figured it out. The small component on the left enables twistable variable brightness. From off to infinitely variable to high. The VBC (Variable Brightness Component or Control) could be thought of in a similar way to a potentiometer, however it is a far simpilar & less mechanical than that.
All to be said at this stage is its thanks to Quantum Tunneling!
How Techy is that! Wee VBC with Quantum Physics.
Video here: Wee VBC.
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