Derby's Street Lighting PFI Contract

Sowter Road, City Centre (Including Sowter Road Underpass)

The existing street lighting consisted of the following items in 1997:

Seq. No. Lamp Number Location Lamp Type Watt Isolation Point
1 107073 JUNC ST MICHAELS LN N/A N/A Y
2 34972 ADJ EMEB SONE 150  
3 34973 REAR OF SQUASH CLUB SONE 150  
4 34974 OPP PUMP STATION 3 SONE 250  
5 34975 BTWN BRIDGES 1 & 2 SONE 150  
6 34976 JNC FP TO BRIDGEGA SONE 150  
7 106915 ON L34972 FL 8  
8 106916 OS SILK MILL MUS FL 8  
9 106917 BTWN UNDERPASSES FL 8  
10 106918 JUNC DUKE ST FL 8  
11 107074 BETWEEN U/PASSES - SWITCHROOM 5 N/A N/A Y

Meanwhile, the existing underpass lighting consisted of the following items in 1997:

Seq. No. Lamp Number Location Lamp Type Watt Isolation Point
1 34977 UNDERBRIDGE 1 FL 65  
2 34978 UNDERBRIDGE 1 FL 65  
3 34979 UNDERBRIDGE 1 FL 65  
4 34980 UNDERBRIDGE 1 FL 65  
5 34981 UNDERBRIDGE 2 FL 65  
6 34982 UNDERBRIDGE 2 FL 65  
7 34983 UNDERBRIDGE 2 FL 65  
8 99698 UNDER BRIDGE 2 FL 65  

The following photographs were taken on Saturday, 11th June 2011. Not all of the existing street lighting was due for removal at the time, and the underpass lighting had already been replaced as part of an earlier scheme. The remainder of the lights were replaced in November 2011; photographs can be seen further down this page.

The 6 m Mallatite ("PFI Spec") mid-hinged column between the bridges supporting the Ring Road was set to be replaced with...a 6 m Mallatite ("PFI Spec") mid-hinged column...as part of this scheme.

     

The only difference between the two installations was that the 'old' column supported a WRTL Arc 100 W SON-T lantern, whilst the replacement column supported an Iridium running either 45 W or 60 W CPO-TW.

 

The 5 ft 65 W fluorescent fittings installed in the two underpasses had already been replaced at this stage.

 

The replacement fittings are wall-mounted Philips floodlights; each runs a 45 W CPO-TW lamp.

 

How do I know that the fittings are Philips-made? Well, I'm just very clever...

 

Back in daylight, and an 8 m column supporting a Thorn Alpha 8 150 W SON-T lantern was next to be replaced. Two new 10 m columns were installed either side of the outgoing column. Another 8 m column supporting an Alpha 8 was installed in the clearing between the two underpasses before the mid-hinged column was installed. Goodness knows how maintenance on this installation was undertaken; given the height restriction either side of it!

 

The lamp could just be glimpsed from within the Alpha 8's interior.

 

The new lanterns possibly run 140 W CPO-TW.

 

The illuminated 'Give Way' sign at the junction of Duke Street was also set to be replaced for this scheme - given the state of the outgoing post, replacement was long overdue! The signlight attached to the outgoing post was a Pearce Gowshall L68/25 running two 8 W fluorescent lamps; its replacement is a Simmonsigns LUA unit running an LED cluster.

 
 

The remaining outgoing columns along the road were later removed in November/December 2011; the following photographs detailing the works were taken on Sunday, 27th November.

The new lighting along this section of the road consisted of twin-optic Urbis Cabrio lanterns; each optic being fitted with a CPO-TW lamp.

 

The design of the narrow reflectors means that a large portion of the lantern is essentially wasted space.

 

Meanwhile, another Alpha 8 (albeit of a later type than the version seen earlier) was set for removal on the opposite side of the road. Judging by the heavy weathering to this lantern's canopy, it had seen quite a few years' use! Curiously, this example featured a flat-glass cover, when most versions of this Alpha 8 featured a polycarbonate bowl.

 

There are more new columns installed than there were outgoing columns being removed; consequently, some of the new installations did not have an equivalent outgoing column installed nearby.

 

The brackets supporting the new lanterns appeared somewhat spindly in comparison to the Stewart & Lloyd brackets fitted to the outgoing columns.

 

The new columns are 10 m in height; the old columns are 25 ft. The difference in height is very evident here:

 

A flat-glass Alpha 8 was fitted here too. Notice that a stainless steel securing toggle is fitted here - the "bowled" versions featured a plastic toggle.

 

On a Cabrio, the central circular section hinges forwards in order to allow access to the control gear and wiring.

 

Do you ever feel as if you are being watched?

     

The final column supported an integrally-geared Thorn Alpha 3 running a 250 W SON-E lamp. Curiously, this column was located after the low-height warning device; again, possibly causing problems for maintenance vehicles. This is likely to be the reason behind the new column being placed in front of the gantry.

 

A Royce Thompson SC1000 photocell controlled the lantern's operation.

 

The Cabrios are fitted with minature photocells, which cannot be seen from ground level.

 
 

Video


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