I looked at old photos of c. 1900 for the first ELECTRIC lamps in this area, and based my 6" lamp on that scheme. They came in with the electric trams.
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Certainly an interesting light and history
I’m looking for the very boring stark naked highway lights they often are tall pole curved atvthe top with a long half round light shield. These are usually mounted on break away mounts you often see crumpled up ones in th ditch that a truck may have hit . So far I’m thinking of making an arch from 1/2” copper tube then use a copper 90 deg elbow for the top bend and a half round slice of tube for the light portion . Maybe lined with shinny alum foil or oil shed stainless steel. I’ll make a prototype first and get it working before a final . I’ve thought of modeling one in solid works snd having a few 3 d printed in plastic .
The lamp heads have changed with technology, and the cast iron lamp poles have been replaced with steel tubes in some cases, but the rare cast iron "top bracket" is still visible in odd places.
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The early 1900s didn't appear to convert old gas lamps in the UK, that may be a weird, non-historic idea as far as I can see, as the electric utilities wanted to show they were completely different to gas lighting and had bigger, brighter lamps. Also, gas lamps were much lower power, so were smaller lights, needed a hole in the bottom for the lamp lighter to poke his flame up inside the usually Square-ish (Victorian) lantern.
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So the Electric utilities had Big glass globes on much higher poles, as the first lamps had big bulbs, quite big lights, and were expensive so only installed in the town centre where there were shops and people would see how rich the council was to have these new big lights...
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My house (Built in 1908) was built with gas lamps, and converted to electric when the later power station was built and power distributed to the richer homes - maybe after WW1? 1920s? some of that wiring can still be found in the dark spaces of the house. (Not used though).
K2