LpS Event: A Perfect Platform for New Ideas and Innovations
Like in any “Light + Building year”, there is always the question of which, if any, other shows one should attend in Europe. The visitors to the LpS 2016 knew right from the start that they had made the right decision with Bregenz. As always, the show attracted attendees, exhibitors and visitors from all over the world. Arno Grabher-Meyer, Editor-in-Chief at LED professional summarizes the highlights and shows
how the newly introduced program points were received.
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The Perspective of Bio-Hybrid White Light-Emitting Diodes Based on Rubber-Like Down- Converting Coatings
At first, white LED technology seems to be mature. But in truth, the technology is still far from being perfect and research on all LED materials and components is ongoing. At the LpS 2016 the research of Rubén D. Costa, Lukas Niklaus, Katharina Weber and Prof. Uwe Sonnewald from the University of Erlangen-Nuremberg (FAU) was honored with the LED professional Scientific Award. These authors investigated the use of organic light conversion materials for white LEDs. Their research shows that these bio-hybrid white LEDs could lower costs and improve light quality. The article describes the
current status of the research and future perspectives.
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On-Chip Beam Forming Optics Paves the Way for New Luminaire Designs
An LED luminaire’s optical system usually consists of primary and secondary optics. This concept always causes a trade-off between light quality, system size, efficiency and light distribution. New concepts to make secondary optics obsolete have already been researched. Paul Drosihn, Head of
Modular Products, and Samir Mezouari, Optics & Lighting Design Specialist at Plessey Semiconductors present the first of its kind chip scale beam forming technology, StellarTM. They explain how it works and how it helps to overcome the limitations of traditional optical solutions for LED lighting.
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Tech-Talks BREGENZ - Prof. Christian Cajochen, Univ. Basel, Head of Center of Chronobiology
Human Centric Lighting has become a catchphrase used by industry and the press. But the press has also started reporting that research emphasizes the danger of LED lighting in connection to our health and has coined the term “Blue Light Hazard”. These claims have caused confusion amongst end users and throughout the lighting community. Prof. Christian Cajochen, Head of the Centre for Chronobiology
at the University of Basel - an expert on this topic - held a lecture at the LpS 2016 entitled “Light Beyond Vision”. Afterwards, LED professional seized the opportunity to talk to him personally and get some in-depth information about the risks and benefits of LED lighting.
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Optical Lithography Method for Advanced Light Extraction in LEDs
Objective material selection for various target applications is key for successful product development. Efficient light extraction features are crucial for highly efficient LEDs. Thomas Uhrmann and Harun Solak, et.al* from EV Group and Eulitha AG will demonstrate a novel lithography method, PHABLE™, that enables the printing of sub-μm patterns in a non-contact, proximity process.
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Handheld Photometry Supports LED Lighting Design
With SSL new dimensions were introduced to light measurement, especially concerning handheld light
measurement tools. Norbert Harkam, General Manager at SalesLink GmbH, a Representative of UPRtek, explains what criteria have to be considered and what the requirements of a handheld photometer are.
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LEDs Reveal Paintings Hidden in Paintings
Artists are often early adopters of new technologies and new solutions and methods that bring art to a new
level. For fine arts artist, light and their material are the two major elements to play with. It’s no wonder that
LED lighting has become an important element for them. The artist, Clint Eccher, and Arno Grabher-Meyer
from LED professional show how LED lighting is used to transform static paintings into some of the most
advanced paintings in the world, in dynamic, “living” pieces that transform their appearance with LED light.
Clint Eccher's work, how it is done, and the role of LED technology will be explained.
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Botanical Light Pollution - Red is the New Blue
In the beginning, the industry argued that LED lighting could help reduce light pollution. Meanwhile,
various organizations claim the opposite effect is true and often sight light color as an issue.
The opinions of different groups are frequently quite the contrary to those of other groups.
Ian Ashdown, FIES Chief Scientist at byHeart Consultants & Lighting Analysts, demonstrates and
discusses the negative effects of light pollution through LED lights and how different light sources
affect vegetation.
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How to Design with LEDs: Concurrent Engineering Yields Fully Optimized Lighting Systems
LEDs are often viewed as a replacement for other light sources. The right starting point for designing an
appropriate replacement is crucial to the result. Brian S. Jasenak, Optical and Process Engineer at
Kopp Glass, describes a concurrent engineering approach that optimizes the optics and other system
components, and may help to reduce the number of LEDs needed as well as the overall cost of the
LED lighting fixture.
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High-Index Nanocrystals - Key to Next Generation Advancements in Lighting
Solid-State Lighting is destined to be a next generation lighting option. LEDs have already entered main stream applications and OLED technology has advanced greatly in the past few years in terms of efficacy and performance. Both technologies need to continue to improve performance to achieve high market acceptance. Dr. Gregory Cooper, Chief Technology Officer and Founder of Pixelligent Technologies LLC, illustrates how LED and OLED technology can advance to the next level by incorporating nanomaterials into existing packaging.
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Easing Lighting System Design with Online Tools
The technical intricacies of an LED lighting system design can be quite complicated. The
interdependencies of design parameters such as light source flux, efficacy, lumen maintenance,
drive current, series/parallel light source layout, compatible optics, compatible drivers, thermal
dissipation and others make the calculation of system performance a laborious process if
performed manually. One simple change in one parameter could potentially force the lighting
designer to consult the datasheet for every other component considered in the design in order to
calculate the impact on the system as a whole. Patrick Durand, Worldwide Technical Director,
Future Lighting Solutions demonstrates the capabilities of modern online tools to solve these
problems giving a typical application example based on the Future Lighting System Creator (LSC).
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Technologies for Engineering an LED Light Closest to Sunlight
TRI-R is a next-generation LED light source made possible by Toshiba Materials technology and
commercialization together with TOL STUDIO. Using natural light that recreates the solar spectrum,
TRI-R suppresses glare, prevents the loss of object color, and gives fresher, clearer expression to
textures and details. Based on professional research examining the relationship light has with humans
and the environment, this is illumination technology that provides the world surrounding us with the
true and real value of light. Masahiko Yamakawa, Senior Specialist of Toshiba Materials Co.LTD.,
presents how this technology was developed and applied in some projects.
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Lighting Fabrics - A New Approach for Flexible Light Sources
Different groups from the lighting business have been dreaming of truly flexible light sources for a long
time. OLEDs are being promoted as the solution of the future but there are other solutions already on
the market. Managing Director R&D at Carpetlight GmbH, Mr. Till Sadlowski, takes a look at the
common history of light and fabrics, the evolution of flexible circuity and the latest development in form
free scalable light sources.
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MOCVD Platform for Cost-Effective Production of GaN-based HB LEDs
GaN-based blue and ultraviolet light emitting diodes (LEDs) are steadily becoming more widely used in solid-state lighting (SSL) applications [1-3]. Enabling dramatic energy savings when compared to contemporary incandescent bulbs and fluorescent lamps, these high-brightness LEDs (HB-LEDs)
have a market potential in the billions of dollars. Yole Development estimates that by 2017, the market for LEDs will be approximately $75 billion [4, 5]. Shiping Guo, the Senior Technology Director of Advanced Micro-Fabrication Equipment Inc. presents a new approach to support this goal with a cost effective MOCVD solution for HB-GaN LED manufacturing.
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Tech-Talks BREGENZ - Sebastian Huelck, Director Lighting, EBV Elektronik
Solid State Lighting has not only changed the way that light is generated but also how areas or objects
are illuminated. It has changed the whole industry and business. Sebastian Huelck, Director of Segment
Lighting at EBV Elektronik GmbH & Co. KG, discussed these changes and the new requirements for
modern distribution with Siegfried Luger and Dr. Guenther Sejkora. He explained the transition of
distributors from pure logistic specialists to one-stop shops and full service providers, and commented
on regional differences. He finished off by giving insights into the future projects of the company.
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OLED Technology in Lighting Applications
Prototypes and niche applications with OLEDs for lighting have been demonstrated over the past few years. Now there are indications that OLED technology is ready for mass production or at least will be ready very soon. Franco Musiari, Technology Specialist at ASSODEL analyzed the current
status and future perspectives of OLED technology.
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Natural Design for Heat Sinks
The luminous flux of LEDs decreases with the rise of the operating temperature. Therefore the dissipation of the heat is, aside from the efficiency of the LED chip itself, an essential part in the development of efficient LED systems. Christian Herbold and Cornelius Neumann from the Light Technology Institute at the Karlsruhe Institute of Technology analyzed natural inspired shapes and show an approach to heat
sinks that combine high thermal performance with a high aesthetic value.
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LED and Lens Degradation Through Volatile Organic Compounds
In general, LEDs are very resistant light sources. Nevertheless, glues, conformal coatings, o-rings, gaskets, and potting compounds, all materials that are frequently used in the construction of LED based luminaires or lamps and often contain volatile organic compounds (VOCs) may have a
negative impact on performance, reliability and lifetime. Edward Steinke, application engineer at Cree, explains the set of problems and how to prevent these issues based on Cree’s products, using their test kit components, as well as components for lamp and luminaire applications.
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Der Lichtpeter, Peter Erwin on Flicker Beyond Perception Limits - A Summary of Lesser Known Research Results
Well, our opinions join quite well. How about to have the CFD by Der Lichtpeter as the first really eligible method to measure light modulation [...] Read more »
Gyula Major on Flicker Beyond Perception Limits - A Summary of Lesser Known Research Results
The article is astonishingly good. I’d like to make only one comment. It was mentioned in the introduction “...for high quality lighting very likely a [...] Read more »
Discomfort Glare Perception of Non-Uniform Light Sources in an Office Setting
LED based luminaires with different luminance patterns and recently, with increasingly non-uniform luminance patterns are becoming mainstream. This trend makes discomfort due to glare an important topic. Based on an office setting and the comparison of results from three different regions, L. M. Geerdinck, J. R. Van Gheluwe and M.C.J.M. Vissenberg from Philips Research have reviewed the currently used formulae to predict discomfort glare to ascertain if they are still valid.
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Quality and Health Aspects of LED Lamps for the European Residential Lighting Market
Because of shortfalls in regards to consumer information about high quality, energy efficient, substitute
products for incandescent lamps, there has been a significant amount of irritation on the side of the
consumer. As part of the Intelligent Energy Europe Program of the European Union, Prof. Dr. Georges
Zissis from the Paul Sabatier - University Toulouse and his team investigated 370 LED lamps. All relevant
parameters of 95 different lamp types from store shelves in 12 European countries were measured and
evaluated regarding quality and health issues.
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LED Lamps Recycling Technology for a Circular Economy
While having a long propagated lifetime, LED lighting products, especially lamps, have a foreseeable
end of life. And since they contain many valuable elements they practically beg to be recycled.
However, like other highly integrated electronics products recycling is not a simple task. Andrea
Gassmann, Jörg Zimmermann, Roland Gauß, Rudolf Stauber and Oliver Gutfleisch from the
Fraunhofer Project Group Materials Recycling and Resource Strategies IWKS and the Technische
Universität Darmstadt Institute for Materials Science respectively, present and discuss a method that
could open the way to successful recirculation of precious components and materials.
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LED professional (sl) on Status of Micro- and Nanostructured 3D LED Technologies
Siegfried Luger: You're right. This interview was done in the past. We are looking forward to publish any news about this topic. Furthermore, don't miss [...] Read more »
Ahn on Status of Micro- and Nanostructured 3D LED Technologies
Giorgio Anania: The prototypes will be available at the beginning of next year. The first products will be qualified in the second half of 2014 [...] Read more »
High-End White Light Sources Fiber Optics Technology for Medical Applications
Often technologies that are too expensive for the mass market at the beginning are already adopted
in medical applications. When reaching a certain level of maturity, costs usually become more
reasonable and adaptations for the consumer market begins. Holger Laabs, Oliver Mehl and
Henning Rehn from Osram GmbH present a light source technology and its prerequisites for fiber
optics that could become one of these technologies.
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Status of Micro- and Nanostructured 3D LED Technologies
Conventional LEDs are planar, two-dimensional (2D) devices that emit light from a thin material layer at or near their flat surface. The vast majority of LEDs are made of GaN and InGaN material requiring expensive substrate wafers made of sapphire, silicon carbide or gallium nitride. The 3D WireLED
technology uses silicon wafers for wafer diameters of 8 inches or larger. On each wafer, millions of vertical microwires and microrods of GaN are grown, each with a diameter of less than one micron. Mr. Arno Grabher-Meyer and Mr. Siegfried Luger from LED professional, talked with the General Manager of Aledia, Mr. Giorgio Anania about the status of this innovative technology.
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TM-30 or the Quest for New Metrics to Measure Light Color Quality
As the lighting industry’s need for an unambiguous measure of lighting color quality becomes more
urgent, the TM-30 test method put forward by the Illumination Engineering Society of America (IES)
is one approach that could offer a solution. Arno Grabher-Meyer, Editor in Chief at LED professional
gives a quick status overview.
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Concepts to Overcome Lifetime Issues of LED Drivers
Lighting technology has changed significantly in recent years after a century of little to modest
advancements. LED luminaires offer advancement in lower power consumption and expected life.
Maggie Nadjmi, EE Product Manager at SL Power Electronics, explains why this new technology
will probably not meet the life and reliability expectations if no attention is paid to the drivers and
power supplies used to power LEDs. She discusses the main components affecting lifetime and
how to eliminate them or design a product to still achieve the desired lifetime.
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Flicker Beyond Perception Limits - A Summary of Lesser Known Research Results
Since the introduction of fluorescent lamps, the lighting industry knows about flicker issues. However,
many aspects are still unclear. Especially effects beyond the flicker fusion threshold are mostly ignored,
and sometimes even denied. Dr. Walter Werner, CEO of Werner Consulting, gives a summary of
research results indicating that further research is needed and that for high quality lighting very likely a
much higher PWM modulation frequency is required.
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