Lighting : LIGHTING-April-2017
40 LIGHTING MAGAZINE | April/May 2017 April/May 2017 | LIGHTING MAGAZINE 41 TheAuroraCentreisahigh-riseofficebuilding situated at the heart of Wellington’s business district within walking distance of the Parliament, Lambton Quay and the Civic District. The Aurora Centre has recently been redeveloped connecting the tower, which was formerly known as Unisys House, and the neighbouring Aurora Chamber. Kiwi Property Group, the owner and developer, secured a long term lease with the Ministry of Social Development (MSD) as the tenant for the entire building. Originally constructed in the late 1960’s, the tower needed a significant refurbishment to bring it into alignment with current expectations regarding office environments, as well as significant earthquake strengthening. The last major renovations were completed in the mid-1990s when contemporary lighting technologies included T8 fluorescents, Cat2 louvres and extra-low voltage halogen lamps. The Aurora Centre is the first building in New Zealand to utilise fluid viscous dampers to stabilise the tower in a seismic event, and an 800mm seismic joint separates the two main buildings. These seismic interventions proved their worth in the magnitude 7.8 Kaikoura Earthquake on 14th November 2016 when the building received no significant damage. The office space is designed to be fluid and uninterrupted over the seismic joints which caused coordination issues for the various engineering services, but ultimately resulted in a space that is both hospitable and functional. Although the majority of the building is office space dedicated to MSD there are some public retail spaces on the ground floor. BY PONTUS HAMMARBÄCK The Aurora Centre, Wellington CASE STUDY The consultants received a strict design brief which called for daylight harvesting in perimeter zones, presence sensing in numerous spaces, as well as strict energy efficiency guidelines for luminaires, to name a few. The brief also called for high illuminance uniformity across the floor plate. To add to the complexity of the design, the Aurora Centre was constructed with exposed overhead structural beams with suspended ceilings between the beams. Services and cabling required penetrations through the beams introducing significant structural, cost and time implications. Furthermore, luminaire spacing was significantly hampered by the structural bays, resulting in the need for a creative lighting layout. A natural side-effect of the low ceiling height was a reduction in range of the presence sensors. This was turned into an opportunity, allowing sensors for each structural bay, increasing granularity and made grouping and future re-grouping of luminaires and sensors easier. It quickly became clear that one management system, integrating all lighting, would be the most suitable solution. In this way, all lighting could be fed from a reduced number of electrical circuits, drastically reducing cable runs and penetrations and facilitating cross-service coordination. It was decided to include emergency lighting monitoring in the DALI system to further reduce cable runs and to avoid having dual systems for general lighting control and emergency lighting. DALI was chosen because of its ubiquity, open standard and availability from most manufacturers. TOP: The main lobby contains a parametrically designed artwork with internally illuminated glass cylinders. Lobby and public area lighting is automatically controlled through the lighting management system. ABOVE: Lighting in the perimeter zone is automatically dimmed and then turned off when ample daylight is available. Throughout the office area, presence sensors assures lights to be on only where people are present.