LIGHTING & LIGHTING CONTROLS FEATURE


Successful revitalisation of a light ceiling with Tunable White


A new light ceiling spans the counter hall at Valiant Bank at Bahnhofplatz in Bern, Switzerland. The ceiling panels are backlit by LED technology from Tridonic. With its Tunable White function, the solution picks up on the dynamic properties of natural light and enables variable colours to be generated


A


fter eight months of refurbishment, architects have carefully and


imaginatively revitalised the Valiant branch at Bahnhofplatz, Bern, a listed building from 1913. To gain more office space on the upper


floors, the light ceiling was closed in the 1970s. While a return to a daylight ceiling was not possible, efficient LED technology, which now backlights the ceiling panels, picks up on a key aspect of the historic solution. Taking inspiration from nature, the ceiling simulates the changes in natural daylight over the course of a day. “The solution from Tridonic, which


allows us to seamlessly vary the light colour between 3,000 and 6,000k and to simulate daylight changes,” explains David Breil, director at Licht+Raum, the company that planned and implemented the light ceiling.


EASY INTEGRATION OF LED TECHNOLOGY AND CONTROL In the ceiling coffers, Licht+Raum used its square low-profile ZETA luminaires. The ZETA luminaire housing made of aluminium is closed off in the room by a


cover of satinised acrylic. If the luminaires are fitted with LED modules, the material reliably disperses individual LED light points, producing homogeneous illumination. The luminaires are equipped with LED


light engines from the Tridonic QLE Premium Tunable White family. The modules offer infinitely adjustable colour temperatures at constant luminous flux, but can also be dimmed between 100 and 10 per cent without colour shifts. The series comes in various designs, with each luminaire containing four LED light engines in square versions (QLE) with a luminous flux of 1,250lm each. Tridonic offers complete packages


consisting of an LED engine, LED driver and matching lighting control components. The customer can choose the necessary LED light engines, the lighting control protocol and the desired control interfaces (touch panel or switch) and will receive a package tailored to their project.


AUTOMATIC AND INDIVIDUAL The LED drivers provide digital interfaces for various lighting control protocols –


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DALI DT8, DSI, switchDIM and colourSWITCH. In the counter hall at Valiant Bank the light is controlled via DALI x/e-touchPANEL 02. Thanks to its 7 -inch colour touch screen, it serves as a start-up, control and operating unit. User-friendly software enables scenes to be programmed and recalled manually or on a time-controlled basis. A Tunable White program has already been installed at the factory and only needs to be linked to the desired schedule. In the counter hall, the lights will go through a gradual change of colour temperature, starting at warm white in the morning, moving on to neutral white and cold white at midday, and finishing with warm white in the evening. Various lighting scenes for non- everyday use are also stored. The lighting can be controlled and dimmed manually at any time via the touch panel.


MIX OF TRADITION AND HIGH TECH “We are proud that our historic property from 1913 is now offering such friendly and open premises,” says Marc Andrey, press officer at Valiant Bank. “Old and trusted yet modern – the new branch perfectly combines these two attributes and the revitalisation of the light ceiling is an impressive example of that.” Starting as a traditional architectural


element, the light ceiling has now returned to the counter hall with modern technology, giving it a very special quality thanks to the dynamic light.


Tridonic www.tridonic.com/en


ELECTRICAL ENGINEERING | JUNE 2017 23


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