Lighting system design based on LED and OLED technologies is challenging. Preferred solutions have to incorporate the latest technologies, smart systems, new standards, advanced functionalities and new user behaviors. Therefore, a holistic design and engineering approach is required in order to develop successful LED Lighting Systems for the future. Integrated designs form the core of this year’s symposium program. All lectures, workshops and tech-panels are linked to this central theme. Experts from various disciplines are coming together to present, discuss, exchange and explore best practices and develop new lighting concepts and designs for optimized environments. The new approach that was implemented this year intentionally links theory and practice. The first two days of the Symposium feature inspiring lecture presentations in four parallel sessions and are followed by an interactive third day full of workshops and discussions to foster information exchange and practical applications.
Lecture Presentations from International Experts
The most important trends and visions in future LED lighting systems, materials and manufacturing, light sources, reliability and lifetime, engineering of LED optics, electronics and smart lighting as well as design with LEDs and OLEDs are covered in the 58 lectures presented by international experts from industry and research.
One of the lecture presentations is about the development of a new color fidelity index, called CRI2012, presented by Dr. Kevin A.G. Smet from the Research Council Flanders. Attendees learn the theoretical and practical uses of the new color metrics. Traditionally, the CIE color-rendering index (CRI) has been used to describe the color rendition of white light sources. However, the CRI index fails to accurately predict the color rendition of narrow-band or spiked spectra. This has increasingly become a problem with the advent of Solid-State Lighting, as the inability to correctly assess the color rendition of these light sources might hinder the acceptance of this new lighting technology.
A further presentation is from Ralph Christopher Tuttle, Application Engineering Manager at Cree. His presentation is on the insights into the problem of the color shifts of LED packages, and he will also cover the important topic of failure mechanisms in Solid-State Lighting. “High temperature results can be used to accurately model LED behavior at lower temperatures”, Mr. Tuttle said.
Human Centric Lighting (HCL) is a key topic in the lighting industry nowadays, promising a lot of future business potential. Dr. Walter Werner is a former System Architect at the Zumtobel Group and is presenting the challenges of HCL with a focus on components, controls and the networking environment. “We have some more steps to take before humans are back in the center of interest when it comes to lighting”, he said.
Interactive Day: Workshops and Tech-Panels
The third day of the LpS features five workshops and two tech-panels, which run on five parallel tracks. Topics like Visual Perception, Luminary Design, 3-D Printed Optics, LED driver designs for Smart Lighting and Zigbee for wireless lighting solutions are discussed and demonstrated. Prof. Mehmet Arik, known as the “Edison of the 21st century”, is opening the workshop series with his keynote about “Breakthrough Technologies and Strategies in SSL Developments – Thermal Management of LEDs”. He has written over 125 papers and four books and holds more than 40 patents. Dr. Arik compares LED lighting systems to smart phones or tablets: “They are advanced systems and require a great team effort. Additionally, we have to make these systems affordable. Chips are already getting cheaper. Compact and low-cost reliable electronics, lightweight and compact thermal management will be key technology drivers for the next decade”.
LED technology offers new spectral and radiative features for lighting applications where conventional quality criteria and measures are not sufficient enough. At the same time, knowledge about light impacts on human and human needs has increased significantly over the last two decades. The workshop “Visual Perception” deals with the most important features regarding visual and non-visual perception which has to be respected for LED applications, including spectral quality, color mixing, light directness and shadowiness as well as flicker and color shades. Bartenbach Research and Development deals with this topic in their workshop.
The lighting industry is facing a shift from wired towards wireless connectivity, driven by several trends. The way people control devices is changing. New value added functionalities in automation are becoming more common and enhancing the customer’s experiences. Additionally, wireless technology is now available at low prices. Consequently, a unified approach is required to enable system compatibility. Therefore The Connected Lighting Alliance (TCLA) has defined the ZigBee Light Link standard as the preferred common open standard for wireless controlled lighting, which is introduced and discussed in detail at their workshop. NXP, Philipps, Lutron and the ZigBee Alliance will explain how to implement this standard.
All visitors of the LpS are invited to participate in the two tech panels and to enrich the discussions with their knowledge. A completely new and inspiring way of discussions for deeper interactions of the audience with the panelists was implemented this year. The first discussion is more general, discussing strategies and technologies for LED systems, related to the aims of the International Year of Light (IYL). Prof. Reine Karlsson, Director Inside Light at Lund University, Dietmar Zembrot, President of Lighting Europe, Carlos Lee, Director General at EPIC and Colin Faulkner, TCLA, are taking part as panelists. The second Tech-Panel is more technical and deals with design and engineering for future LED lighting systems. The panelists in this discussion are Dr. Martin Zachau, head of Osram’s research organization, Dr. Kevin Smet, Research Foundation Flanders, Dr. Mehmet Arik, Ozyegin University, Turkey and Dr. Norman Bardsley, President of Bardsley Consulting.
As one of the highlights of the event, Day One debuted the presentation of the LED professional Scientific Award. The paper from Mr. Peter Bodrogi from the Technical University of Darmstadt, Germany, about ‘New Binning Strategy for White LEDs to improve the Color Quality of Interior Lighting’, was awarded as the best scientific paper in the areas of LED and OLED light sources and was honored with 3,000 EUR, sponsored by Optonica LED. Mr. Bodrogi graduated in Physics from the Loránd Eötvös University of Budapest, Hungary and obtained his PhD degree in information technology from the University of Pannonia in Veszprém, Hungary. He co-authored numerous scientific papers and invented patents in the domains of self-luminous display technology and lighting technology.
The awarded paper proposes a new binning strategy to describe and easily communicate the magnitude of acceptable chromaticity differences in LED luminaries for interior lighting. The proposed new binning strategy uses an updated color space to overcome the deficiencies of the ANSI binning strategy. It uses easy-to-understand categories. Both white tone differences and color homogeneity of important colored objects can be characterized. The new binning strategy resulted from a series of visual experiments on the semantic interpretation of instrumentally measured color differences. Semantic categories of color similarity effectively communicate the magnitude of chromaticity differences between the LED light source manufacturer and the producer of the interior lighting product.
International Exhibition and Product Launches
The exhibition space has been extended this year for 100 world-renowned exhibitors such as Samsung, Cree, Infineon, Wago, Fischer, Bayer Material Science, Arrow and OEC. The exhibitors are presenting their latest technologies, products and services at the LpS 2014. UL, OptonicaLED, Auer Lighting, Tridonic and Osram are this year’s sponsors.
The reputation of the fair is growing and leading companies are increasingly using the LpS as a platform for their European or global product launches at the LpS. This year, Auer Lighting is introducing their light guides made of borosilicate glass using injection-molding technology. This technology resists heat better than the plastic counterparts. Data Link is presenting a new lamp designed with their new patented planar and AC LED technology. BQ Ceramics is showing their first ceramic-coated metal core PCB with integrated heat sink, which offers superior thermal conductivity at reasonable costs. ELT is introducing two new driver product lines: The LC-XT, which is characterized by very low current output ripple (2%) and low THD and the LC-UN universal voltage multi-power LED drivers.
Everfine is presenting their new high accuracy array spectroradiometer, called HAAS-3000. This spectrometer incorporates two innovative approaches to improve stray light rejection and linearity of the measurement system. Gigahertz-Optik is presenting a new spectrometer that specializes in color measurement in industrial applications. LUXeXcel is introducing their new 3 D printing process for optics. They released a new high quality material that is competitive with injection molding for the production of small and mid-size optics.
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