While we're on the luminary thing... Here is an "Admiral's Hat" street series incandescent luminary in Westfield, NJ with brown porcelain head and bracket arm wire holder insulator. This fixture now operates on a multiple circuit (120/240 v) but originally was designed for series use which could place primary voltage across the conductors under certain conditions, series circuits being fed as they were from a constant-current transformer directly from the primaries, hence the seemingly 'extreme' insulation measures in its design. This type luminary is common in some suburban NJ towns although nowhere to the author's knowledge are they still connected to a series circuit, having either been converted to multiple a long time ago or perhaps having been initially placed in service in multiple even though a series type unit. The series circuit lines, if they ever existed at all, are also nowhere in evidence. The present bulbs are most likely 189 watt, 2900 lumen PS-25 multiple lamps, about as close in the multiple department as there is to the 2500 lumen 6.6 amp series lamps with which these units were likely originally equipped.