GEC Z9539

Lantern acquired in May 2010.

This lantern was installed on an abandoned Stanton 10F concrete column on a road that was once within the perimeter of the Pastures Hospital site in Mickleover. Following the closure of the hospital in the early 1990s, many of the identical installations around the site fell into disrepair, however, the lighting on this particular road remained in use, owing to the small number of business that occupied the lower section of the road. The most notable business was the Grangecraft Garden Centre; this itself closed briefly in 2005, but re-opened as the Mickleover Garden Centre a few months later. The garden centre closed again in early November 2008, and this time, it didn't re-open. The site was subsequently cleared and currently (as of May 2010) is being prepared for a new use. Whilst the lighting along the road hadn't worked since approximately 2003, the columns still carried a live supply until April/May 2010, when the cable was disconnected and removed from the former hospital-related building at the end of the road that had provided the isolation and switching point for these lights.

The first couple of photographs show the lantern, as it appeared in March 2004; when the garden centre was still open.

Fast-forward to May 2010, and the lantern is now no longer installed. It was removed just under a week before these pictures were taken. The column door was also missing by then.

The lanterns and brackets were missing from all but one of the installations visible from the locked gate. I suspect that the remaining bracket was left alone due to it being in a poorer state of repair than the others were.

Placing your cursor over the following highlighted photographs will replace the image with that of the corresponding photograph of the other Z9539 in my collection. In this way, both lanterns can be compared.

From the side, few differences are apparent between the two lanterns - both are fitted with discoloured polycarbonate bowls. The only noticeable difference is that this lantern is not fitted with a photocell, whereas the other Z9539 has a P42 detector fitted to its canopy.

When removed, the canopy was (almost literally) caked in bird dirt. A few minutes under the jet of a pressure washer soon sorted this problem out!

A small drainage hole had been drilled in the centre of the bowl.

Only when the bowls are removed from the two lanterns do some real differences start to appear - the Brownhills Z9539 is in a much better internal condition due to it remaining in use right up until its removal, whereas the Grangecraft Z9539 had not been in use for several years prior to its removal: damp has been able to enter the lantern (helped by the lack of a gasket), leading to corrosion setting in on the gear tray. In addition, the bowl on this example probably hadn't been opened in around sixteen years - the OSRAM lamp seen here dates to April 1994; the last time any maintenance was undertaken on this lantern! Prior to the lantern's pressure-washing, the inside of the canopy was awash with numerous dead spiders and woodlice - even after cleaning, the lantern still carries a revolting earthy smell...just think yourselves lucky that this smell cannot be conveyed on the pages of a website - it was rather horrific!

With the lamp removed, the P42 relay and connector can be seen attached to the Brownhills example's gear tray (such components are normally installed within the base of the column). The gear tray on the Grangecraft example was held in place with a single screw (when two would have been fitted originally), however, this was found to be seized, and had to be drilled out before access could be gained to the gear.

The gear on the Grangecraft lantern is in a terrible condition - both the ballast and capacitor are severely corroded, whereas the gear from the Brownhills lantern is in an altogether less corroded state. Notice that both of the lanterns sport capacitors positioned at an angle. I had originally thought that the presence of the P42 controller within the Brownhills example was the reason for this, however, as the Grangecraft example also features a capacitor that is not in-line with the ballast, it was obviously a GEC decision to fit the capacitors like this; perhaps for ease of connection. The unused slots beneath the capacitors suggest that these lanterns were originally designed for the 'bottle-shaped' capacitors, as seen on the aluminium-canopied Z9532, but by the mid 1970s, when these lanterns were produced, cylindrical capacitors were instead fitted. This wouldn't be altered until the Z953# range of lanterns was modified towards the end of that decade, in order to cater for the then-new, and more efficient Z1616P ballasts with 6.5μF-rated capacitors.


A few days after the above pictures were taken, I decided to free the ballast from the gear tray, just to see whether the bolts were seized or not. After much effort, I was successful in freeing them, however, the ballast still could not be moved. I was able to lever it away from the gear tray using a screwdriver; doing so produced the sound usually heard when two items that have been glued together are being separated. The reason behind this was soon all too clear - it appears that the internal oil within the ballast had leaked and then congealed between the ballast and the gear tray. This would have contributed to the strength of the unpleasant smell mentioned above. Owing to the age of these components, I was rather concerned that this oil might be a harmful Polychlorinated Biphenyl (PCB). The gear tray will therefore be discarded in its entirety. The canopy will be retained.

Philips FGS 103 | Philips 'Mini Iridium' BGS 451


Lanterns in the Z953# range in collection

Z9531 Z9532 (aluminium) Z9532 (GRP) (1) Z9532 (GRP) (2) Z9536 (aluminium) Z9536 (GRP) Z9538 Z9539 (1) Z9539 (2)




© 2002 - English Street Lights Online