Off Halesfield 9, 14, 20 and Clews Wood Roundabout, Sutton Hill, Madeley, Telford and Wrekin, Shropshire With thanks to LeoLampposts for informing me of these Survivors. Installed on private buildings throughout the Halesfield Industrial Estate are several notable lighting installations; a disused yard on Halesfield 9 features three 8 m tubular steel columns, with each supporting a Thorn Alpha 3 lantern for 250 - 400 Watt MBF (mercury vapour) or SON (high pressure sodium) lamps. Halesfield 14 keeps with the use of Thorn by having a Gamma 6 post-top placed on a 5 m column in the car park for a business, while a premises at the end of Halesfield 20 has three floodlights attached to its building; unusually, these each run a 135 Watt SOX (low pressure sodium) lamp, making them considerably larger than floodlights designed for MBF or SON lamps would be. Not to be outdone, the Clews Wood Roundabout, which links Halesfield 8, 9, 10 and 13, has a high mast installed in its centre, topped with eight GEC Z3430s.
Two of the Halesfield 9 Alpha 3s are pictured below; notice that the foreground example's bowl is missing; this was still the same in 2009, and even then, the yard appeared largely disused.
Despite the bowl damage, an elliptical lamp remains connected within the lantern.
The rearmost example's bowl remains in place, and the lantern appears clean internally.
The third column is seen from an adjacent company's car park.
On this Alpha 3, the bowl is not quite forming a full seal against the inner gasket, leading to considerable water ingress being present.
The bowlless example is seen again from the front, with the size of the lamp suggesting that it is a 400 Watt example.
The Gamma 6 is attached to a sheet steel column in the car park of a premises that is towards the end of Halesfield 14. Google Street View imagery confirms that a second column used to exist in the car park, but had gone completely by 2015.
The Gamma 6 is the more unusual variant, with a shallower base casting. The same Google Street View imagery suggests that the lantern ran an MBF lamp in 2009, suggesting that the necessary lamp control gear would have been housed in the column base; the shallower lantern casting being unable to accommodate control gear itself.
Much of the original black paint applied to the canopy has worn away, revealing the aluminium beneath.
The SOX floodlights attached to the building on Halesfield 20 appear so much more industrial and cumbersome than the replacement LED floodlights installed nearby are, though the difference is that the older floodlights would outlive the modern replacements many times over!
Judging by the colours produced by the indium oxide film on the SOX lamp's outer bulb, and its arc tube construction, this is probably a GEC / OSRAM product, produced at the company's factory in Shaw, near Oldham, in the 1980s - 1990s.
The floodlights carry Thorlux branding on their support brackets.
The second floodlight is seen just above the compound's access gates. As a length of cable still exists between the fitting and the building structure, it may still be operable, although this is unlikely to have occurred for many years.
The third floodlight is a little further along the building again, and is complemented with a halogen floodlight resembling a Thorn Sunflood.
The high mast in the centre of the roundabout is likely to have become abandoned, as dedicated lighting columns around the gyratory were installed by March 2021.
Having eight lanterns on this mast, with all (possibly) running a 400 Watt lamp, seems somewhat overkill for the amount of traffic that would be likely to traverse this roundabout after nightfall.
Although the lamp focus positions could be set on each individual lantern, in the case of this setup, with there being a ring of lanterns illuminating a roundabout, the lamps are probably all set to their default positions with the main beam being directed forwards.
The entire top section of the mast would lower for maintenance, using a winch-based mechanism installed within the mast itself.
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