Holophane brightens up maintenance

Extensive refurbishment of a maintenance hangar at Gatwick Airport has included installation of 112 Prismpack high bay luminaires from Holophane Europe. The installation has provided Gatwick Airport with a 17% reduction in energy consumption, equivalent to over 80,000kWh. Lighting control and illuminance levels have also been improved.

Prismpack luminaires were specified by Bryan Tatham of consulting engineers WWP Consultants: “We looked at a number of options for the new lighting, including T5 fluorescent and induction lighting, and determined that the combination of Prismpack luminaires and 400W pulse-start metal halide lamps gave us the best solution for this application.

“The photometric characteristics of the Prismpack have enabled us to achieve the required lighting levels at ground level using 17% fewer fittings than previously, thus reducing the installed lighting electrical load. In addition, the prismatic reflector provides some indirect light to the ceiling and vertical surfaces – which has been complemented by repainting of the walls to increase their reflectance. The overall effect is that indirect lighting to the underside of the aircraft has also been improved, so that some tasks are now less dependent on localised task lighting.”

Hangar 6 at Gatwick Airport is used for maintaining a range of different aircraft so the lighting requirements vary considerably. For example, the people working on one large aircraft would require more bays to be lit than for a smaller aircraft. The previous lighting, however, did not provide the flexibility to control the lighting in relation to this variation, so all of the luminaires were on for most of the time, irrespective of actual need. As well as wasting energy, this reduced lamp life and increased re-lamping costs as luminaires have to be accessed by either aerial work platforms or by using a ‘luxlift’ lowering mechanism for luminaires closest to mezzanine areas.

“Each Prismpack fitting is on a separate circuit, so there is considerably more control and each of the four bays can be illuminated individually, with lighting switched off completely in unused bays or reduced to allow access through the space. This also addresses the voltage drop problems that were experienced with the previous lighting, as well as lessening the impact of a single circuit failing,” Bryan noted. “As a result of the lower installed lighting load and enhanced control, the lighting energy requirements of the hangar have been reduced significantly, while the longer lamp life (20,000 hours compared to the 10,000 hours previously) will reduce maintenance costs,” he concluded.

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