Vintage Tungsten High Bay

Spotted these old incandescent high bays in one of the old hangers at the former RAF Duxford airbase which is part of the Imperial War Museum.
These are probably original to the buildings when they were built in the 1920's.
The other hangers have Thorn HiPak's and LED things in them.

A few still had tungsten lamps in them, but many other has LED corn lamps...