12O. St Thomas Street, London Borough of Southwark Attached to a wall bracket that is situated above a door on Conybeare House, belonging to Guy's Hospital, is a 1930s' GEC Z8125 'Fulham' lantern; designed originally to run a 250 - 400 Watt OSIRA (the name OSRAM, GEC's lamp company, gave to its) mercury vapour (MA/V) lamp. When photographed in July 2023, a notice on the door mentioned that the building was not in use, which may indicate the operational status of the lantern too; however, given that the building is Grade II listed, the lantern's future should be relatively secure, as the listing should cover it too.

The lantern's age is evident in its copper construction - after the Second World War, aluminium became the preferred material for most lanterns.

The lantern's original Difractor (spelled "Di-fractor" at the time that the lantern was made) bowl has been replaced with a translucent teardrop bowl instead. At least, it is sympathetic to the design of the lantern, although it is bolted to the outer rim, when the original bowl would have sat within this. A sister lantern, the "Di-fuser", employed the same canopy, but was sold with a different style of bowl. Thus, the lantern seen here could, in fact, be one of these instead.

The cast iron GEC anti-condensation connector remains attached above the lantern. Notice the makeshift earth bond that terminates at the right-hand screw for the connector cover.

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