The original Desk lamp that I bought only had a little Push Button.

This was too less to operate on/off, brightness, color and certain other features.

So I was thinking can we use something else simple and elegant:

In my mind came the rotary Knob from my stereo. What a Nice and elegent Aluminium knob that perfectly fits to the design of the lamp.

On Aliexpress I found a perfect one for my design: This Knob perfectly matches perfectly and is not too expensive