Local WRTL/Industria Deltas
Along with the Philips SGS 101, the Delta is normally restricted to being used on footpaths within Derbyshire (not Derby City), although it is occasionally used as a regular road lighting lantern as well.
This Delta (running a 50 W SON-T lamp) is installed on a footpath just off Megdale, in Matlock. The column was installed when concerns were raised over the night-time visibility of the adjacent anti-cycle barrier. The lantern is fitted with a miniature photocell; the idea being that such devices are less conspicuous than traditional one-part NEMA photocells are.
This wood pole-mounted Delta is on Kings Newton Lane, on the approach to Melbourne. The 70 W SON-T lantern was fitted in place of a 1980s' Thorn Beta 2; at the same time as the adjacent Derby Road junction was realigned in early 2011.
The Delta differs from the earlier 2600 lantern in that it will accept either side entry or post-top spigots without the need for additional accessories.
Returning to column spigot-mounted examples, this Delta (again, running a 70 W SON-T lamp) is installed on a 6 m hinged column on a footpath linking Vicarage Gardens and Anchor Close in Swadlincote. An identical installation (not pictured here) exists further along the footpath.
These Deltas also appeared in early 2011; despite this, this lantern's canopy has already received attention from local birds!
When viewed from the other side, it could be seen that the lantern's bowl was not correctly fastened at the time of photographing.
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