New demands

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 formed the core of this year’s symposium program. All lectures, workshops and tech-panels were linked to this theme. Experts from various disciplines were 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 linked theory and practice. The first two days of the Symposium featured inspiring lecture presentations in four parallel sessions and were followed by an interactive third day full of workshops and discussions to foster information exchange and practical applications. The most important trends in future LED lighting systems, materials and manufacturing, reliability and lifetime, engineering of LED optics, electronics as well as design with LEDs and OLEDs were covered in the 58 lectures presented by experts from industry and research. One of the lecture presentations from Ralph Christopher Tuttle, Cree was on the insights into the problem of the color shifts of LED packages, and he also covered 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.

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. 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. He co-authored numerous scientific papers and invented patents about 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 binning strategy resulted from a series of visual experiments on the semantic interpretation of instrumentally measured color differences. Semantic categories of color similarity communicate the magnitude of chromaticity differences between LED light source manufacturer and the producer of the interior lighting product.

The exhibition space had been extended this year for 100 world-renowned exhibitors such as Samsung, Cree, Infineon, Wago, Fischer, Bayer Material Science, Arrow and OEC. The exhibitors presented their latest technologies, products and services. UL, OptonicaLED, Auer Lighting, Tridonic and Osram were 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 was introducing their light guides made of borosilicate glass using injection-molding technology. This technology resists heat better than the plastic counterparts. Data Link presented a new lamp designed with their new patented planar and AC LED technology. BQ Ceramics showed their first ceramic-coated metal core PCB with integrated heat sink, which offers superior thermal conductivity at reasonable costs. ELT was 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 was 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 presented a new spectrometer that specializes in color measurement in industrial applications. LUXeXcel introduced their new 3 D printing process for optics. They released a high quality material that is competitive with injection molding for the production of small and mid-size optics.