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Lighting : April 2010 Whos Who of Lighting
ENERGYSMART BUILDINGS 29 6 1: The One Shelley Street structure essentially comprises two window- dressed buildings designed to maximise natural light, separated by a central atrium. 2: A distributed single-lamp solution lights the open-plan office areas, with a light power density of just over 5W per square metre 3: The integrated system also controls lighting and blinds in several board and meeting rooms 4: The impressive central atrium. 5: Featuring restrained LED architectural lighting, the central atrium is overlooked by a series of meeting ‘pods’, which feature motion sensors and time-out sequences to minimise energy usage (Photo by Andrew Krucko). 6: One Shelley Street is the new Sydney premises of the Macquarie Group continued on page 30 ➤ 5 Fundamentally, the lighting system is programmed to operate in two distinct modes - ‘trading’ and ‘after hours’ - which are timer-based. Although the precise timing and functionality is individually configurable for each floor and/or zone, it essentially corresponds to ‘lights on’ at the commencement of trading mode, followed by a timed sequence of dimming to ‘lights off’ when the system goes into after hours mode. At this time, motion sensors are activated in amenities areas and lift lobbies to initiate lighting if motion is detected, with a 30-45min time- out sequence. Intermittent-use areas, such as the meeting pods, utilise motion detection at all times. When in trading mode, daylight harvesting sensors ensure that the perimeter lighting is dimmed when natural light is available. “There is a massive amount of perimeter on this building, coupled with the full-height, high-performance glazing. Even on a cloudy day you get excellent usable daylight penetration from outside, so the perimeter lights should rarely be on anywhere near 100 per cent during the day,” Salisbury says. DALI masterclass A key consideration in sustainable commercial fit outs is making sure the building will accommodate re-configuration as tenancy requirements change. This means the lighting solution - for the open office areas in particular - needs to cater for a multitude of different scenarios and be easily configurable. To ensure the required level of flexibility, the digital addressable lighting interface (DALI) data protocol and transport mechanism is used in the main open office areas. Up to 64 individually addressable DALI devices - including the fluorescent HF ballasts and various sensors - can be controlled by a single DALI network (or ‘universe’). Moreover, control groups/zones can be configured and reconfigured from a computer terminal, without reconfiguring the fittings themselves. According to Salisbury, this is where the DDBC320 DALI controller from Philips Dynalite comes into its own as the only controller on the market that can control three DALI universes – up to 192 ballasts/devices per controller. “We have used a single controller for each ‘quadrant’ (or half-floor) in the two adjacent buildings,” he said. “Yet all the DALI ballasts can be individually controlled – be they dimmed or switched – depending on how you set up the zones. There’s ultimate flexibility to cater for tenant functionality and environmental influences – dimming wherever and whenever.” Another energy-saving feature of the DDBC320 DALI controller is that it powers down the DALI universe when not in use. The controllers have integral relays that switch off standby power to the DALI ballasts, when luminaires are dimmed to zero per cent. “That is the difference with this system,” said Anthony Seddon, Philips Dynalite NSW State Manager. “With most DALI systems all the ballasts have to be powered up all the time, because they need to know if the signal is coming. But with this system there’s no wasted energy.” Salisbury adds that this is not such an issue for buildings that operate 24/7, but the reality is most commercial buildings shutdown for long periods every day.
Whos Who of Lighting 2009
April May 2011