Local WRTL Luma 2s (Philips BGP 625s)
The big brother of the Stela, the Luma LED lantern first saw use in Derbyshire in 2013, when the roundabout above the M1 at Junction 29 underwent a complete relighting; this included the replacement of all existing local authority-owned lighting columns and cable infrastructure. The 120 LED version of the Luma 2 lantern was employed, with each lantern being fitted to the spigot of a 12 m aluminium passively-safe column.
An unusually-quiet view of the Junction 29 roundabout, with several of the new columns visible. This view is taken from the Doe Lea side of the A617 dual carriageway.
Unlike the Stela, the LEDs in the Luma are placed behind a toughened glass panel, in order to create a full cut-off distribution.
The tilt angle of these lanterns is adjustable - loosening the two horizontal grub screws visible on the back of the lantern allows the lantern to be tilted to +10 degrees above the horizontal; however, the downside to this setting would be a more glary appearance for when viewing the lantern from the front.
Six separate matrixes, each containing 20 LEDs, make up the full 120 LED cluster. These lanterns are group-controlled from a separate feeder pillar, and automatically dim to 70 per cent output between midnight and 6 am.
Luma 2 lanterns first appeared in Derby itself in 2015, as part of the 'Infinity Park' development off Wilmore Road, in Sinfin.
The lanterns are fitted with Telensa radio nodes in place of NEMA photocells, in order to allow for remote switching, as well as dimming during the quieter periods of the night.
These lanterns are attached to Mallatite 10 m tubular steel columns.
The difference in column diameter at the point at which the lantern attaches, compared to the rest of the shaft, is evident here.
More Luma 2s were used to relight the re-shaped roundabout linking Kingsway (part of Derby's Ring Road) to the adjacent Retail Park; the modifications being required owing to the construction of a new housing development's access road on the roundabout. These lights were installed in mid-2016. The traffic signals installed as part of the roundabout works only saw a few weeks of use before they had to be deactivated, owing to their causing "gridlock" at the Retail Park.
This column was one of the first to be installed. Originally, a 'large' (SGS 254) Philips Iridium was fitted; this was substituted for a Luma 2 when the rest of the columns were installed a few months later.
Once again, Telensa nodes are fitted in place of photocells.
As can be seen, the tilt of these lanterns is set at five degrees above the horizontal.
These lanterns are also equipped with six matrices; each one running 20 LEDs and giving an overall total of 120 LEDs.
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