Lighting : Lighting August 2016 - Vol 36 Issue 4
36 LIGHTING MAGAZINE | August/September 2016 IESANZ ACT BRANCH TECHNICAL MEETING: LIGHTING FOR HEALTH AND EDUCATION The ACT branch was very pleased to welcome Rob Kilkenny from Eagle Lighting to Regatta Point for breakfast on Tuesday 15 May – a beautiful Canberra morning. Rob was in town to share with us the results of some of the fascinating work Fagerhult has been doing in the areas of lighting for health and for education. After a fortifying buffet breakfast Rob described for us a series of experiments run by Fagerhult on lighting in a classroom and in an aged person’s home. The experiments involved many of the most basic tenants of good lighting that are generally not applied to these work-a-day types of spaces. The results of the experiment in the classroom indicated an increase in student performance due to increased attentiveness. The results in the aged person’s home revealed such unexpected results as improved sleep and reduced falls due to a higher level of wakefulness during the day. Rob discussed topics including photopic sensitivity, biological sensitivity, circadian rhythms, the effect of lighting on cortisol levels, wellness and The Wellness Standard. Rob also touched on TM30-15 and the changes to testing for colour temperature for artificial light sources. Thanks to Eagle Lighting for sponsoring the event and to Rob for a highly informative and interesting session, which gave us all more insight into ways we can improve our lighting designs with techniques that will have a positive impact on students and the aged. – Cynthia Jolley-Rogers IES UPDATES+POSTS Professor Maarten Roeffaers from the Centre for Surface Chemistry and Catalysis explains: “Zeolites contain sodium or potassium ions. We used ion exchange to replace these ions with silver ions. To obtain the clusters we wanted, we heated the zeolites with the silver ions, so that the silver ions self- assembled into clusters.” In collaboration with Professor Peter Lievens’s Laboratory for Solid State Physics and Magnetism, the researchers examined the properties of these heat-treated ‘silver zeolites’. Using advanced techniques, they found that the structural, electronic and optical properties of the zeolites were strongly influenced by the silver clusters. They discovered that the shape of the silver clusters is essential to obtain the right fluorescence properties with an efficiency close to 100%. These findings have great potential for the development of next-generation fluorescent and LED lighting and for biological imaging. The new phosphors not only emit a large amount of light but they are also cheap to produce. (Details can be found in Nature Materials (doi: 10.1038/nmat4652). Figure 1. The Deck at Regatta point overlooking Lake Burley Griffin with a view across to the National Library, and Parliamentary Triangle. Figure 2. Rob Kilkenny from Eagle Lighting presents an informative talk on lighting for health and education to the ACT branch. Researchers from KU Leuven, the University of Strasbourg and CNRS have discovered a new phosphor that could make next- generation fluorescent and LED lighting cheaper and more efficient. The team used highly luminescent clusters of silver atoms and the porous framework of minerals known as zeolites. Silver clusters consist of just a few silver atoms and have remarkable optical properties. However, current applications are limited, because the clusters tend to aggregate into larger particles, thus losing the interesting optical properties. Professor Hofkens and his team from the Molecular Imaging and Photonics Unit have now found a way to keep the silver clusters apart by inserting them into the porous framework of zeolites. The result: stable silver clusters that maintain their unique optical properties. Zeolites are minerals that are either found in nature or produced synthetically on an industrial scale. The minerals have a very rigid and well-defined framework of small molecular- sized channels, pores and cages. They’re commonly used in domestic and industrial applications such as washing detergents and water treatment. WARRUMBUNGLE: FIRST DARK SKY PARK IN AUSTRALIA Warrumbungle National Park in Central Western NSW has been declared Australia’s first Dark Sky Park, recognising and protecting its key role in astronomical research. Planning Minister Rob Stokes and Environment Minister, Mark Speakman, welcomed the park’s new status, following confirmation from the International Dark Sky Association. Mr Stokes said the park’s dark sky qualities will be protected with $100,000 in funding to control light pollution through implementation of updated planning policies. A new Dark Sky Planning Guideline has also been developed with the Australian Astronomical Observatory as part of the NSW Government’s review of state planning policies. “Warrumbungle National Park has long been recognised not only for its beauty at ground level, but also for the wonder it holds in the night sky above,” Mr Stokes said. “It’s an outstanding place to view the night sky and, with the nearby Siding Spring Observatory, plays an important role in Australian astronomical research. As nearby communities grow, it’s important we plan to protect the park’s dark sky qualities from light pollution now and into the future.” Mr Speakman said that light pollution has a detrimental effect not only on professional and amateur astronomy, but it also impacts on those parts of the ecosystem, such as nocturnal animals, which are reliant on dark night skies. Australian Astronomical Observatory Head of Lighting and Environment Professor Fred Watson led the nomination for the Warrumbungle National Park to be Australia’s first Dark Sky Park. NEXT-GENERATION FLUORESCENT AND LED LIGHTING THANKS TO NEW PHOSPHOR?
Lighting June 2016 - Vol 36 Issue 3
Lighting October 2016 - Vol 36 Issue 5