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PROJECT / LED BRIDGES, ARUP LIGHTING
Singapore’s Helix Bridge is the first time in the world a double-helix structural solution has been applied to a bridge. Arup’s lighting designers emphasised the DNA- inspired design through a series of dynamic multi-coloured Space Cannon LEDs installed on the helix structures
approximately US$56 million, the delivery was managed by the Department of Public Works.
Sophistication in Hong Kong harbour Stonecutters Bridge is the world’s second longest spanning cable-stay bridge, with a main span of 1,018m. The bridge is situ- ated in one of the highest profile locations in the world, the centre of Hong Kong harbour, straddling the Rambler Channel at the entrance to the Kwai Chung container terminals, providing a landmark gateway to Hong Kong, one of the world’s most vibrant trade centres. With a highly distinctive form, its key design features include the steel main span that is supported by two 290m tall concrete and stainless steel towers and a 53m-wide deck split into two streamlined boxes and con- nected by cross girders.
The simple yet elegant lines of this bridge are picked out with crisp cool white light to reinforce their beauty and the simplicity of the bridge structure against the backdrop of the local golden night sky.
The lighting scheme is based around three key architectural elements: the tower bea- cons and light strips; the tower pylons and the cross-girders. A wash light with colour temperature of 4,000K+ is projected on to the face of each tower, with arrays of metal halide projectors equipped with narrow to medium beam optics, starting at the deck
and tapering off towards the top and base of the tower. The cross girders are also lit to create a continuous, subtle glow of light. These form a neutral clarity theme as a backdrop for the occasional festive colour light shows.
The beacons and light strips on the mono- pole bridge towers are the two key ar- chitectural elements integrated with LED luminaires, allowing the creation of a dynamic colour palette of light to add a narrative dimension to the bridge at night. The translucent glazed screens on top of each tower are back-illuminated with LED projectors fitted with vertical wall washing optics to create the beacons. A combination of wall grazer and ‘direct view’ LED lumi- naires built into each light strip provides a distinct delineation to the strip and broaden the viewing angle for these from afar. The design of the architectural lighting reflects the prevailing night-time conditions of the bridge’s surroundings, in particular the intensely-lit cargo terminals nearby. The day-to-day base lighting scene has the LEDs programmed to cool white colour, such that elegant lines of this bridge are picked out with crisp cool white light to reinforce the beauty and simplicity of the bridge structure against the backdrop of the golden night sky of Hong Kong. A key element used to convey different messages in lighting schemes is colour: red is associated with happiness, prosperity (in
Chinese culture), excitement, energy and power; while gold and silver are associated with wealth and prosperity. Various display sequences of complimentary colour patterns were explored as a narrative to express the characteristics of Hong Kong. It is a place which offers a diversity of experiences; a place where east meets west, blending Chinese heritage and British colonial influ- ences. With a separate theme, gold and silver were chosen to express its place as a financial city in a metaphorical way. The LED lumi- naires are programmed to illuminate all light strips and the beacons in golden yel- low, and the lighting sequence is set to cre- ate a pulsing effect along each strip. White light elements propagate up and down the defining edges of the light strips against the predominantly golden yellow lights. The architectural lighting over the entire bridge is programmed to switch on at dusk and be switched off at a set time after midnight. The cross fading of colour light- ing in the light strips and beacon that is controlled by Digital Multiplex technology, is programmed to express the characteritics of the city with special light shows on festive occasions. The speed of the fade is preset such that the dynamic effect can be seen from afar but is not a noticeable distraction to anyone driving across the bridge.
www.arup.com/lighting
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