Local WRTL Luma 1s (Philips BGP 623s)

Along with the larger Luma 2 lantern, the Luma 1 LED lantern made its Derby début in 2015 as part of the 'Infinity Park' development off Wilmore Road in Sinfin.

This lantern is installed on a footpath that is located opposite the new development.

The lanterns are fitted with Telensa radio nodes in place of NEMA photocells, in order to allow for remote switching, as well as for dimming during the quieter periods of the night.

These lanterns run four separate matrixes of 20 LEDs, which, if we then apply the advanced mathematics, equates to 80 LEDs per lantern.

Owing to the proximity of overhead high voltage electrical conductors, all of the columns in this area are of a reduced height. They are also base-hinged, in order to facilitate any future maintenance from ground level. The columns are arranged in an 'opposite' configuration, in order to provide sufficient light levels across the full width of the road.

Cast into the top sides of the lanterns are a series of waves - these act as a heat sink for the temperature-sensitive LED array immediately below.

The slim profile of these lanterns can be appreciated here.

The construction of a new parking area opposite the shopping precinct on Prince Charles Avenue in Mackworth in mid-2016 saw new 10 m columns fitted with Luma 1s installed. These replaced existing 10 m columns fitted with Philips 'Iridium' SGS 253 lanterns that were erected as part of Derby's Street Lighting PFI a few years previously.

Despite being only about a year old when these pictures were taken, the lanterns were already turning white, thanks to the local bird population! The label that is attached to the lantern's spigot entry is a warning about attaching the lanterns to 76 mm diameter spigots (as is the case here), but I was unable to determine the exact nature of this warning from the ground.

Double-arm columns were installed between the main carriageway and the car park; necessitating the lanterns to be installed side-entry (this is the 'Local Side-Entry Lanterns' section, after all!). The shadow of the estate's iconic 1950s' clock can be seen on the tarmac.

Although not visible in this view, Telensa nodes operate these lanterns too.

These Luma 1s also run 80 LEDs, though their running current could be higher, owing to the lanterns being at a greater mounting height, which would require the LEDs to be operating more brightly.