An unpainted section of the column, from where the bracket was situated, is visible below the lantern. The lantern itself is coloured light grey to RAL 7035.
16 LEDs are situated in the centre of the lantern's optic, although there is space for double that figure in this version of the Kirium.
A small number of Kirium Pro 1 lanterns were installed on new mid-hinged columns on a footpath that passes alongside the A38 between Queensway and Kedleston Road.
These lanterns are painted black (RAL 9006), but the LED quantity remains the same.
This Kirium Pro Mini is one of several installed on Bramblehedge Drive in Sinfin. These lanterns replaced Philips Iridium2s, again in 2019, that were installed when the housing development was new in 2014. Despite the relatively new nature of the original lanterns, changing to LED must have been a more cost-effective solution, particularly as the Iridium2s would have been afforded by the company that constructed the development.
These tiny lanterns measure 390 mm (15·35 inches) in length, 110 mm (4·33 inches) in depth (excluding the post-top spigot and 227 mm (8·93 inches) in width.
Once again, 16 LEDs are installed; the maximum quantity available with this version of the Kirium.
Kirium Pro Mini lanterns began to replace WRTL Arcs around Mickleover's Brisbane Road estate in July 2021. The Arcs dated from around 2005, when new 6 m columns were installed, replacing the (largely) 5 m concrete columns that were original to the estate's construction in the 1950s-60s. Main roads were lit with 100 Watt SON lanterns, while 70 Watt lanterns lit the side roads. The swap to LED would, therefore, see a dramatic reduction in power consumption for these lights.
Sadly, the existing, reliable Royce Thompson SC1000/SAV 35 Lux photocells that were fitted to the Arcs were not reused on the Kirium Pros; instead, Zodion ZCellLED photocells rated at 20 Lux, the first notable use of these photocells in Derby, were fitted.
These examples began to replace Philips MA 90 90 Watt SOX lanterns (dating from the early 1990s) on Callow Hill Way on the Heatherton estate in Littleover in early 2022. A couple of remaining MA 90s are visible in the background.
The brackets were removed, and the lanterns installed on the column spigots.
These examples incorporate 48 LEDs.
From the smallest lanterns in the Kirium Pro range to the largest, now - a number of Kirium Pro 3 lanterns were installed on the A52 Borrowash Bypass as part of the road's widening at its junction with the Wyvern Retail Park.
Coincidentally, these lanterns were also used as direct replacements for Iridium2 lanterns that replaced Thorn Triumph 2 lanterns in 2011.
The lanterns are equipped with Telensa Telecell Controllers fitted to their NEMA sockets; these control the operation of the lanterns remotely.
Adaptors are fitted to the narrow side-entry brackets, in order to allow the much wider lantern spigots to attach securely.
From ground level, these lanterns seem rather large and bulky.
Then again, they are - the lanterns measure 1010 mm (3·31 ft) in length, 167 mm (6·57 inches) in depth and 415 mm (16·33 inches) in width.
These lanterns accommodate 96 LEDs - four groups of 24 LEDs.
The maximum quantity of LEDs that this version of the Kirium can accommodate is 128 - I expect that sunglasses are provided as standard at that amount!
The lanterns weigh 17.5 kg (38.58 lb) each.
Not all of these lanterns are fitted to double-arm columns; some are mounted post-top.
The wide surface area of these lanterns makes them an ideal podium for wood pigeons to use and survey all that lies below!
A small number of single-arm examples exist too.
An older version of the Telensa node is fitted here; these incorporate a more prominent antenna than the newer examples do.
Light grey Kirium Pros began to replace 250 Watt Philips SGS 204s approaching the junction where the A516 Uttoxeter New Road meets the A5111 Kingsway / Manor Road.
The columns and brackets were treated to a fresh coat of paint at this time too, with their original Derbyshire Green finish being replaced with the Balfour Beatty corporate dark blue.
These lanterns are fitted with Telensa telecells too - previously, many of the SGS 204s here had been group-controlled from the photocell on the lantern whose column was located adjacent the feeder pillar. With the new lanterns requiring a permanently-live supply, some of the remaining SGS 204s were dayburning in the transition period.
Looking towards Kingsway, the columns are arranged in an opposite formation, owing to the very wide carriageways on both sides of the road at this point.
These lanterns feature narrower side-entry spigots than the earlier A52 examples do.
These lanterns are brighter too - the full complement of 128 LEDs per lantern (four groups of 32 LEDs) is used. Even when viewed from ground level, it is clear that these are longer than the Philips lanterns - almost to the extent that they look slightly out of proportion.
