A DEMANDING brief for a street light which stipulated resident and councillor approval, compatibility with the local CMS system, compliance with the requirements of a conservation area and a dramatic reduction in carbon compared to the existing stock has been satisfied with a bespoke luminaire.
Hertfordshire County Council drew up the specification specially for the 625 replacement street lights for the conservation area of Welwyn Garden City.
The lighting design criteria stipulated by HCC was that the lumen output and performance on the road was equal or better than the existing lighting, whilst maintaining the aesthetics of the luminaires.
During the tender process CU Phosco created a bespoke LED version of its P107 post-top luminaire.
The P107 was originally used in some areas of Welwyn using previous HID technology. The company developed an LED version to meet all current lighting standards including compatibility to the Telensa CMS system used by Hertfordshire County Council.
The development of the product incorporated a trial scheme to establish approval through combined involvement with local residents, WGC councillors, HCC Highways Engineers and the contractor, Ringway, to ensure all parties were satisfied with the product both aesthetically and performance wise.
The specification was to provide an LED light engine delivering an equal lumen output to the existing streetlights.
Initially a clear bowl was specified, however CU Phosco’s technical engineers also presented an opalised version.
The opalised version was well received and a decision was made to use opal bowls in keeping with the existing luminaire appearance whilst delivering the required lumen output and energy efficiencies.
As CU Phosco Lighting is located within Hertfordshire, site visits, technical development and the final delivery enhanced the carbon offset requirements stipulated in the tender.
A 70 per cent average saving in energy over the previous luminaires installed within the WGC conservation areas has been achieved.
The luminaire energy calculations are based on LED full power when in light and do not include any dimming regime which can be adopted by HCC via the Telensa CMS.
Jonathan Watt, LED replacement project manager, told Lux: ‘This style of lighting is unique in Hertfordshire and required careful consideration to satisfy all the stakeholders.
‘These issues included the appearance, lighting level, glare and opacity, value for money, maintenance, compatibility with the central management system and energy costs.
‘As if that is not enough the lighting is in conservation areas, highly esteemed by the residents. The lighting is an integral part to that and we consulted with councillors, planners and local preservation groups to ensure the solution met expectations.