Articles & Interviews

Research | LpR Article
A Self-Compensation Approach for Maintaining the Chromaticity Coordinates of Phosphor Converted LEDs Upon Temperature Variations
A Self-Compensation Approach for Maintaining the Chromaticity Coordinates of Phosphor Converted LEDs Upon Temperature Variations Solid-state light sources for general illumination applications are currently becoming more and more popular. Maintaining chromaticity coordinates over temperature is a challenge. Wolfgang Nemitz, Franz P. Wenzl, Susanne Schweitzer, Christian Sommer, Paul Hartmann from the Institute for Surface Technologies and Photonics at Joanneum Research, and Paul Fulmek and Johann Nicolics from the Institute of Sensor & Actuator Systems of the Vienna University of Technology investigated this issue and propose a promising new solution. Read more »
Tech-Talks Bregenz
Tech-Talks BREGENZ - Ewing Liu, Everlight, Technical Marketing Manager
Tech-Talks BREGENZ - Ewing Liu, Everlight, Technical Marketing Manager LED manufacturers have different strategies and approaches for their product portfolios depending on from which business they are originated. Everlight has a very long experience in optoelectronics as packaging company. Accompanied by Christopher Keusch, Director of Lighting Business EMEA, Ewing Liu, Technical Marketing Manager at Everlight, talks about about the background of the company, the worldwide strategies and upcoming techologies. Read more »
Research | LpR Article
Direct Current (DC) Supply Grids for LED Lighting
Direct Current (DC) Supply Grids for LED Lighting Since many alternative energy sources as well as electronics and controls technologies are based on DC current, DC grids have been investigated more intensely in the last decade. DC grids with a centralized AC/DC conversion have proven to be advantageous in server farms. While LED lighting is also a DC current related technology, an obvious choice would be to use DC grids for them. Prof. Eberhard Waffenschmidt from the Cologne University of Applied Science in conjunction with Philips Research presents the results of an office building DC lamp system installation with photovoltaic (PV) support. Read more »
Leading Article | LpR Article
2015 Year of (LED) Light
2015 Year of (LED) Light The advent of artificial lighting has revolutionized society. 2015, in particular, will go a long way in establishing solid-state light-based technologies as a vital area of innovation for the 21st century. Dr. Amrita Prasad from LED professional gives an overview of the technical evolution of (LED) lighting and how this may have triggered UNESCO’s decision to make 2015 the Year of Light. Read more »
Research | LpR Article
LED Office Lighting for Improved Well-Being and Performance
LED Office Lighting for Improved Well-Being and Performance The influence of artificial light in industry has been a topic of conversation for a while now but opportunities provided by LED lighting have made this subject even more important. Katrin Möller, Junior Researcher at the Competence Center Light, her research partners, Vincent Grote from the Human Research Institut, and Birthe Tralau from Zumtobel Lighting, investigated the effects of LED and fluorescent lamp lighting on human well-being and performance in an office environment, in a comparative laboratory study. Read more »
Technologies | LpR Article
A New Approach to the Design of Driverless AC LED Light Engines
A New Approach to the Design of Driverless AC LED Light Engines Driverless AC LED light engines have now become a commonplace item of commerce in the lighting industry. Nearly all of them use high voltage integrated circuit switching chips to intelligently change the number of LEDs in a string during a power line cycle so that the voltage of the LED string matches the instantaneous power line voltage. However, customers are demanding higher efficiency, lower cost, and especially a reduction in the flicker content of the emitted light. Peter W. Shackle, president of the consulting company, Photalume, describes some new circuits for AC LED light engines [1] that provide a non-dimming solution with reduced cost, increased efficiency and better light quality as perceived by the human eye. Read more »
Technologies | LpR Article
Street Lighting Evolution through LED Technology
Street Lighting Evolution through LED Technology Standard electronics is usually based on a relatively simple straight-forward technology. Outdoor lighting is more challenging in several aspects, especially robustness. This is also true for the electronics. Sandra Solán, R & D Manager from ELT Electronic Division has studied this technology in depth. To celebrate the IYL 2015 she will explain technical advances, benefits, strengths and technical challenges of current and future street lighting systems for an electronics manufacturer. Read more »
Commentary
A Confusing Situation that demands Solutions: Performance Specification
A Confusing Situation that demands Solutions: Performance Specification Product innovations are not the only consequence of recent advancements in the lighting market. These changes must be accompanied by a realization that the “old” methods for specifying the performance of lighting products no longer fully apply and need to be amended. From the perspective of DEKRA, an organization specialized in the testing and certification of SSL products, the current situation shows the following picture: Read more »
Commentary | Aug 05, 2015
LED Innovation will Offer a Human-Centric Smart Lighting Platform Enabling Enterprise IOT
LED Innovation will Offer a Human-Centric Smart Lighting Platform Enabling Enterprise IOT After a century of analog electrical light, the lighting industry has spent the last decade in transition to digital light sources; LEDs, sought to replace the tungsten filament. LEDs are now embedded in all market segments in both residential and commercial applications. The predictions of early LED pioneers such as Dr. Roland Haitz have become reality today: more lumens delivered at a lower cost with increasing reliability and quality of light attributes. As a result, the world of electrical light has accepted that LEDs will be its primary light source and contribute to saving significant electrical energy, reducing carbon emissions and providing increased safety and comfort in our homes, at work and even while commuting in traffic. Read more »
Commentary | Aug 05, 2015
IYL 2015 - Light is Live, Light is Culture, Solid State Light is Progress
IYL 2015 - Light is Live, Light is Culture, Solid State Light is Progress On 20 December 2013, the United Nations General Assembly proclaimed 2015 as the International Year of Light and Light-based Technologies (IYL 2015). This was the culmination of a long and concerted effort by a large consortium of scientific bodies, working together with the United Nations Educational, Scientific and Cultural Organization (UNESCO), where the initiative was adopted by its General Conference in November of the same year. Read more »
Quality | LpR Article
Guidance on Specifying Solid State Lighting Luminaires
Guidance on Specifying Solid State Lighting Luminaires Certification marks of renowned test institutes are useful tools for end users to easily estimate the quality of a product. They are also a good marketing tool for manufacturers to generate user trust and confidence in a product or the brand. The authors, Jaap Nuesink and Michael Schoof from DEKRA Certification B.V. explain what is needed and which parameters have to be covered in order to be certified, ending up in a guideline of how to qualify for the DEKRA Solid State Lighting Certification Mark. Read more »
Trends | LpR Article
LEDs are Revolutionizing Light – The Past and Future of Lighting
LEDs are Revolutionizing Light – The Past and Future of Lighting Light is a basic part of life as such and modern living relies on artificial light. Lighting is a constantly developing, even accelerating technology, with LEDs representing the current zenith. On the occasion of the beginning of the IYL 2015, Stephan Wegstein representing VESTEL, a leading contract manufacturer in Turkey, has been asked to explain the challenges this poses and how suitable strategies and technologies can assist in staying on top of developments. Read more »
Trends | LpR Article
Making Light Work – Light Sources for Modern Lighting Requirements
Making Light Work – Light Sources for Modern Lighting Requirements Solid state light sources are the core of modern lighting installations. To get in the right mood for the IYL 2015, Dr. James Gourlay, Chief Technology Officer with Design LED Products, looks at the ways to make LED lighting more efficient, satisfy user demands and to bring SSL design to the next evolutionary level. Read more »
Technologies | LpR Article
Solving the Phase-Cut Dimming Challenge
Solving the Phase-Cut Dimming Challenge The evolution of dimmable LED lighting is an ongoing subject and phase-cut dimming is often dissatisfactory. While some weaknesses may be acceptable in residential applications, they are definitely not acceptable in professional applications. Stage lighting, studio lighting, TV and movie lighting set the highest standards. Craig Sharp and Bill Trzyna, Research & Design Engineers at CCI Power Supplies LLC discuss which developments helped to overcome limiting obstacles and led to a solution that also satisfies stringent requirements. Read more »
Interview
Exclusive Interview: Nobel Prize and Global Energy Prize Winner Prof. Shuji Nakamura
Exclusive Interview: Nobel Prize and Global Energy Prize Winner Prof. Shuji Nakamura On June 19th, 2015 Nobel and Millennium prize winner, Professor Shuji Nakamura was awarded the Global Energy Prize in St. Petersburg, Russia. The Global Energy Prize is given to researchers in the field of energy efficiency and renewable technologies on a global scale. During the Global Energy Prize Event in St. Petersburg, Professor Nakamura gave an exclusive interview about the developments and future of solid-state lighting. Siegfried Luger, CEO of Luger Research, Event Director of the LpS 2015 and Publisher of LED professional, talked with Professor Nakamura about LED substrate technologies, violet and ultra-violet emitters, nano-technologies, OLEDs and laser technologies. Read more »
Technology | Sep 07, 2015
Background Information on the Luxeon C LED Family from Lumileds
Background Information on the Luxeon C LED Family from Lumileds In an exclusive interview, Rahul Bammi, Vice President of Marketing & Product Management at Lumileds, and David Cosenza, Product Manager for the Luxeon Color LED Family, disclosed some background information on why this new product family was designed and why the very specific, new, and unique properties were implemented. Read more »
Tech-Talks Bregenz | Interview | Nov 23, 2015
Tech-Talks BREGENZ - Andreas Weisl, SSC Europe, Vice-President
Tech-Talks BREGENZ - Andreas Weisl, SSC Europe, Vice-President Seoul Semiconductor has more than 20 years of experience in semiconductor manufacturing and invests more than 10% of its annual revenue in LED research and development. On average, Seoul Semiconductor applies for more than 600 patents every year. Currently, the company holds more than 10,000 LED patents, including patents in core LED technologies such as Acrich, Acrich MJT, nPola, TV Direct Backlight Technology, UV, and many more. Seoul Semiconductor’s extensive patent portfolio in LED technology includes epitaxial growth, fabrication, packaging, and system application of LED technology. LED professional talked with Andreas Weisl, Vice-President of Seoul Semiconductor Europe GmbH about their business, technologies and solutions. Read more »
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