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  
19 98816 ADJ UNDERPASS SONE 150  
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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