Andrew et al,
First, about the bulb...the only heat in our T is going to be what the power people call -co-generation, if you get my drift <g> No Halogen bulbs, far too dangerous. The bulb in the lamp is LED and ideally that is what I will use for interior lighting throughout.
Your description of the bulbs mode of insertion sounds like what is called bayonet type over here, I think.
As to the wiring in the 'sugar cube' you're spot on...if you tip the light sideways you can see the place to insert the wire and it did work fine and it is pretty simple in that elegant sense of practical and efficient.
I had never seen one before, and I realize now that I had caused my own problems taking my expectation of finding two wires to the way I looked at the sugar cube--I saw 3 sets of two connectors instead of what is there--two sets of three connectors. Duh!
Andrew, thank you very much for your tenacity in penetrating my opaqueness on the sugar cube issue!
Jim