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Lighting : April 2010 Whos Who of Lighting
ENERGYSMART BUILDINGS 31 workstation. With the addition of task lights, the general lighting level provided by the indirect system can be lower than is required for complex reading and writing tasks, meaning less energy is required to light the space. While a standard ‘troffer’ installation with task lights may be more efficient from an energy point of view, it does not lead to an effective visual outcome. In an effort to improve the energy credentials of the lighting concept, it was proposed to utilise the base building DALI lighting control system to its full capabilities. Motion sensors and/or switches with timer overrides were chosen to control the lighting (including the task lighting), and in an effort to prevent over lighting the space, individual luminaires were to be dimmed to a maintained lighting level appropriate for the specific area in question. It was deemed critically important that the lighting controls be simple and intuitive, to ensure the occupants did not subvert the lighting controls. The combination of indirect pendants and low prevailing lighting level allowed fewer luminaires to be used across the space and in the offices, satisfying the architect’s desire for minimalism. The lighting solution for the new DLA Phillips Fox Fitout in Kingston incorporates highly innovative control strategies that are believed to be a world first. These ground breaking solutions addressed issues that were brought about by the inclusion of task lights into the environmentally sustainable design. Until now, it has been difficult (if not impossible) to cost effectively integrate the operation of task lights into a building lighting control system. This problem of task light control was elegantly addressed by a new solution devised by Northrop Consulting Engineers known as the ‘Taskmaster’ system. The ‘Taskmaster’ system is comprised of two principal components, the Control Unit and the desk mounted Power Rail. These devices integrate into the existing base building DALI lighting control system and provide economical control of the task light at the desk. Although the ‘Taskmaster’ system was originally designed for controlling the task lights only, it soon became apparent that the system would be ideal for controlling a variety of power hungry desktop devices. As a result, the final design of the ‘Taskmaster’ system evolved to encompass many different power loads using a clever system architecture. The task light and indirect lighting solution that was used throughout the general office areas consumed an instantaneous load of approximately 7W/m2 (with all task lights turned on). This was the worst case, in reality a considerable number of task lights were switched off throughout most of the day, especially in perimeter offices where there was ample natural light. As the office occupants controlled the operation of their task lights according to the amount of natural light, it was deemed unnecessary to provide photo electric cell control to the offices. The benefit of user control, in lieu of automated PE cells, was that the visual comfort of the worker could be sustained throughout varying light conditions. The DALI control system was also designed with energy efficiency and user comfort in mind. The indirect pendants in the open space were controlled after hours by combination passive infra red and ‘Microphonic’ 360 degree ceiling mounted sensors manufactured by Sensorswitch. These sensors first detect movement using the PIR function and then listen for sounds in the environment to indicate continued occupancy (for example, someone typing at a keyboard). This high degree of sensitivity prevents the luminaires in the space from turning off while the space is occupied, but also allows for shut down time delays to be relatively short. The task lights at each desk are also controlled using the DALI control system through use of the innovative and world first ‘Taskmaster’ system. Northrop Consulting Engineers designed and developed the ‘Taskmaster’ system with the assistance of CMS Electracom and DALI Control. The Artemide Tolomeo tavolo task lights utilise an 18W TC-T compact fluorescent lamp and electronic control gear. This lamp – ballast combination maximises the life time of the CFL source and minimises re-lamping.
Whos Who of Lighting 2009
April May 2011