Very interesting indeed. It seems to be a complex thing for what I thought was a simple lamp to operate. Do you know what is the schematic / principle of operation?
I see a nice old Selenium rectifier in the box, plus resistances and a transformer. But what is the lamp starter switch connected to and how is the discharge ignited?
I suppose the principle is that the transformer first steps down the mains to something closer to the lamp voltage. Then the selenium block creates DC - are there capacitors to smooth the ripple? There is probably also a resistor or other transfo tapping for the momentary light output booster. The ignition is maybe based on a small solid state tesla coil / flyback transfo. It would be great if you can see how that works! I have never lit any of my concentrated arc lamps due to this uncertainty.