Bringing about this magic to one of the city's oldest landmarks is special lighting designed by a Sydney-based company, the Lighting Design Partnership (LDP). Dubbed as rediscovering the landmark through lights, the Rs 1.62 crore special lighting effect will be launched by deputy chief minister MK Stalin on Wednesday.
As many as 464 special bulbs and light fixtures installed along the arches, pedestrian pathways, road surface and under the bridge will give the iconic structure an illusion of floating on the waters.
"It is a rare achievement, as this kind of project may be the first of its kind in India. The project is being implemented using the latest technology in an energy-efficient manner to reduce costs," says Arjun Vijaykumar, managing director, GA Architects, the local consultancy firm identified by the corporation in 2008.
The lighting of the bridge has been carried out in a way to highlight its unique structure. A combination of warm washes has been used to outline the principal external arches and a deep blue infill has been used on the inner flanks.
The outward edge of the bridge is articulated by a series of surface-mounted markers. When lit up, the reflection of the bridge in the Cooum river will add depth and a three-dimensional effect to the bridge.
The types of fixtures used include, metal-halide with LED lamps, surface-mounted floodlights with a combination of coloured glass filters and bollard lighting for road. Lighting scene controllers, which can bring to life eight different scenes, is on the anvil. All fixtures are resistant to extreme temperature and weather conditions.
"The overall installation is kept to a minimum and is designed in an easy to maintain manner. Only long-life lighting fixtures that can withstand the salt content in the air have been used. Care has also been taken to ensure that there is no damage to the structure," Vijayakumar adds. The corporation has engaged a private firm, ETA India Limited, to maintain the lights for a year.
Napier, the governor of Fort St George (Madras Presidency) built the iron bridge across Cooum river in 1869. It was later transformed into a wide-concrete structure in 1943 for vehicular traffic. In 200, during Stalin's stint as mayor, another arch bridge was built on the western side of the existing bridge to ease traffic congestion. The 149-metre bridge built at a cost of Rs 4.32 crores, has six bowstring arches.
Source : https://timesofindia.indiatimes.com/city/chennai/Glowing-Napier-bridge-to-float-on-Cooum-from-today/articleshow/6224855.cms