Should've used black iron
And leds inside the reducer, rather than the bulb.
If they want a bulb hanging out, they may as well have a novel bulb with the filament on display.
One day, when i no longer live in a building site, i would like to build a nixie clock -

Id make it out of some big old lump of 'stuff' (rough bit of concrete / steel / bif of old wood [if it would take the heat]) and mill the holes through it for the nixies.