Thorlux Passlight Lantern Installations

This bulkhead light was previously sold for SON lamps. The Passlight, nowadays, is sold in LED forms, with a power-consumption between 24W-38W. These bulkheads produce 2335lm-3440lm. Due to their intended applications including subways and underpasses, the Passlight has a corrosion-resistant LM6M body, a thermally shock-resistant prismatic glass cover, or a polycarbonate cover. Versions were also available with an anti-vandal cage. These were (and still are) perhaps some of the highest-quality subway lights on the market.

Birmingham

Some SON examples can be sighted along the A47, attached to an industrial building. These are fitted with polycarbonate covers. It's unknown if they still are in use, given the small alleyway they were installed to light has been taken over by nature nowadays.

I pictured two of the installations, but many more are fitted along here. None of these (despite their age) have any significant corrosion on their bodies.