Original GE lucalox from the Holophane Module 600.

Bringing the lamp indoors, I set about trying to bring its severely worn down etch a rub with pencil, to bring all the detail back out. It was photographed against my computer screen, to further bring the detail out.
Its believed to date to 1984, as Holophane lighting from the period always seemed to be supplied with USA made lamp, their main base being of course, in the US. Its a working installation, and is neither pinked out or showing any signs of cycling.