Derby's Street Lighting PFI Contract
Derwent Street, City Centre
The existing street lighting consisted of the following items in 1997; interestingly, the ornate lanterns attached to Exeter Bridge are not listed:
|Seq. No.||Lamp Number||Location||Lamp Type||Watt||Isolation Point|
|1||107022||OS THE COUNCIL HSE||N/A||N/A||Y|
|2||26804||CNR TENANT ST||SONE||400|
|3||26805||O/S HOTEL SITE||SONE||400|
|4||26806||O/S ASSEMBLY ROOMS||SONE||400|
|5||26807||CNR CORPORATION ST||SONE||400|
|6||26808||O/S MAGISTRATES CT||SONE||400|
|7||26809||O/S COUNCIL HOUSE||SONE||400||Y|
|8||26810||OS MAGISTRATES CT||SONE||400|
|9||26811||OS COUNCIL HOUSE||SONE||400|
|10||26812||CNR EXETER BRIDGE||SONE||400|
|11||26813||CNR EXETER BRIDGE||SONE||400|
|12||26814||CNR EXETER BRIDGE||SONE||400|
|13||26815||CNR EXETER BRIDGE||SONE||400|
|14||26816||OPP STUART ST||SONE||400|
|15||26817||O/S LONGBRIDGE HOUSE||SONE||400|
|16||26818||OPP PHOENIX ST||SONE||400|
|17||98814||OPP EXETER ST||SONE||250||Y|
|18||98815||JUNC SLIP RD||SONE||250|
|23||106628||OPP ASSEMBLY ROOMS||FL||11|
|24||106629||OPP ASSEMBLY ROOMS||FL||8||Y|
|25||106630||OPP ASSEMBLY ROOMS||FL||11|
|26||106631||CNR CORPORATION ST||FL||8|
|27||106632||ON ISLAND OPP DERWENT ST||FL||8|
|28||106633||ON ISLAND OPP FULL ST||FL||8|
|29||106634||ON ISLAND OPP CORPORATION ST||FL||8|
|30||106635||ON ISLAND OPP DERWENT ST||FL||8|
|31||106636||O/S MAGISTRATES CT||T||100||Y|
|32||106637||SPL OPP COUNCIL HS||FL||11|
|33||106638||OPP COUNCIL HOUSE ON SPLITTER||FL||11|
|34||106639||OS COUNCIL HOUSE||T||100|
|35||106640||JUNC EXETER ST||FL||8|
|36||106641||JNC SLIP RD/U-PASS||FL||8|
|37||106642||JNC SLIP RD/U-PASS||FL||8|
|38||106643||JNC SLIP RD/U-PASS||FL||8|
|39||106644||JUNC U/PASS OPP NO 91||FL||8|
|40||106645||OPP FANNY'S SANDWICH BAR||FL||8|
|41||114205||ON SPLITTER ON EXETER BRIDGE||FL||8|
|42||114206||ON SPLITTER ON EXETER BRIDGE||FL||11|
|43||114207||ON SPLITTER ON EXETER BRIDGE||FL||11|
The following photographs were taken on Sunday, 27th November 2011, 11th June 2011. Only six of the existing columns installed along this road were earmarked for replacement at the time, and I was fortunate to photograph them for posterity, as parked nearby at the same time was a Balfour Beatty HIAB truck; signifying their imminent removal from service.
Many of the outgoing columns along this section of the road once supported twin-lamp Atlas Alpha 8 lanterns; these were later replaced with Thorn Alpha 3s; all running 400 W SON-E. Over time, even most of these lanterns were replaced; leaving something of a mixture of different lanterns along the road. The PFI scheme would obviously see an end to this.
A Philips 'Trafficvision' was installed on the first doomed column.
Although the lantern had clearly seen many years' use on the road, it was only relatively recently that it appeared on this column - the Alpha 3 that was previously fitted had been replaced at some point between 2008 and the date of these photographs.
The new lanterns installed along here were the 'medium' (SGS 253) version of the Iridium, with each lantern running a single 140 W CPO-TW lamp.
Owing to the width of the carriageway at this point, a second new column had been installed almost opposite.
At the other end of the building, another outgoing column could be glimpsed; this one ended its days supporting a Philips SGS 204.
The SGS 204 has a characteristically 'boxy' appearance.
The Iridium, by comparison, is vastly more streamlined.
Back on the other side of the road, Alpha 8s (albeit, of the later Thorn variety!) were fitted to the final four columns.
The narrow section between the lantern and the painted bracket segment would have originally been housed within the Atlas lantern - these lanterns incorporated wide-diameter spigots, and so adaptors to reduce the diameters to 42 mm had to be fitted when the Alpha 3s (originally) were fitted.
Although the old Alpha 8 columns appear shorter than their replacements, in reality, the reverse is true.
Something of the Alpha 8's Achilles heel is the plastic bowl clip - over time, the plastic becomes brittle from prolonged exposure to ultraviolet light, and can eventually break, causing the bowl to swing open. The presence of insulation tape around this particular example's bowl suggests that the clip (still visible at the front of the lantern) has indeed failed.
As the Iridium's lamp is accessed from within the lantern, and the bowl doesn't open at all, this should not be a problem that the new lantern will face.
A single-armed column overseeing the entrance to the underpass was replaced with a double-armed example, in order for the slip road leading to St Alkmund's Way to be illuminated sufficiently.
This Alpha 8 was group-switched from elsewhere; hence, the lack of a photocell.
By comparison, both of the new lanterns had their own dedicated photocells.
On the slip road itself, a single new lantern sufficed.
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English Street Lights Online
© 2002 - English Street Lights Online