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PROJECT / LED BRIDGES, ARUP LIGHTING
Stonecutters Bridge, the world’s second longest spanning cable-stay bridge, features a lighting scheme based around three key architectural elements: the tower beacons and light strips; the tower pylons; and the cross-girders – all achieved using Philips LED lighting
DNA-inspired design through a series of dy- namic multi-coloured LED lights installed on the helix structures. The outward-facing lu- minaires accentuate the sweeping structural curves, with another discreet array of lights illuminating the internal canopy of glass and steel mesh to create a dynamic membrane of light. The inner helix uses white light to illuminate a path for pedestrians. The latest LED technology was chosen for longevity, recyclability and for the flex- ibility of being able to offer more than 16 million dynamic colours.
When triggered via an intelligent control system, the dynamic lighting sequences accentuate the members, revealing the long sweeping strands as they intertwine along the bridge’s length. The lighting is programmed so that a variety of colours and dynamic sequence effects can be imple- mented for different events and festivals. Careful placement of luminaires ensures that energy requirements are kept to a minimum – and there is not a single lumi- naire on the entire bridge that consumes more than twelve watts of power.
The art of tensegrity Lighting of the new Kurilpa bridge over the Brisbane River in Brisbane, Australia, of- fered its own particular challenges to Arup’s designers.
The 470m long multi-mast, cable-stayed pe- destrian and cycle bridge is the result of a
two-year creative partnership between Cox Rayner, Baulderstone and Arup – a leader in the advanced geometry required for tenseg- rity-inspired structures.
Inspired by the concept of tensegrity, a modern art form and structural system that enables the creation of something very lightweight but incredibly strong, it is the world’s first ‘tensegrity’ bridge. Our lighting designers played on the link between the bridge and the adjacent Gal- lery of Modern Art, lighting the bridge like a permanent art piece – expressing each of the structural elements with a complimen- tary glow.
The lighting creates interest for users and passers-by with an arrangement of LED luminaires programmed to produce an array of lighting effects. The scheme can be tai- lored to cater for events, festivals and sport and is one of the world’s largest bridge LED lighting installations.
During the early evening hours the bridge is lit by white light; it is only later in the evening that its full impact is felt, with the bridge revelling in eye-catching dynamic effects visually expressing each of the masts stretching out to the heavens. One of the main considerations was how to light the architectural and structural features of the bridge in a way that would enhance the strong vertical mast features and the suspended tensegrity structural span beam elements. The accent light-
ing design uses the most up to date LED technology, and is claimed to be one of the largest installations of this type currently in the world. From a technical perspective, the key objectives were energy efficiency, maintenance and the control of light to avoid it spilling onto adjacent buildings. The LED spotlights provide high efficiency optics which in turn enabled the designers to use lower wattage luminaires and reduce energy. Lamp life is much longer than other light sources - a major advantage for maintenance where access is difficult. With the excellent optics available for the LED lamps the designers were much better able to control the light. Each of the luminaires contains an array of red, green, blue and white LEDs, offering more than 16 million hues. Additional white LEDs allow a brighter white light; they are able to switch on in- stantly to 100% and are fully dimmable. Light emitting diodes used to be a gim- mick but now are a serious option for many solutions. The possibilities are endless and lighting designers are only limited by their imagination. Further benefits from using LED light sources come from the energy savings, reduced annual running costs and minimised maintenance. Photovoltaic pan- els are installed on the Kurilpa Park ramp canopy to offset the energy required by the LED accent lighting.
The project is owned by the Queensland State Government – built at a total cost of
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