The lamps which I design and create are made from copper pipe which is polished and then sprayed with a clear lacquer to prevent tarnishing. 
The bases are from upcycled wood which is sanded and waxed with rubber feet attached to protect surfaces but also to give the impression that the lamps are floating.
The bulbs are a retro style filament, bayonet or screw type, some are LED filament maximum 40 w. These bulbs are easy to source.
The electric flex is a retro, twisted 3 strand, in either a copper or gold fabric sheath. A few lamps have a traditional solid 3 core black cable.
The plugs are black 3 pin UK, fitted with a 3 amp fuse. Some of the switches are original Bakelite/ceramic toggle, a few are in-line dimmer while others are on the bulb holder.
All the lamps are PAT tested.