Trends

Trends

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 »
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 »
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 »
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 »
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 »
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 »
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 »
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 »
Resources | Reports | Technologies | Controls | Jul 22, 2015
NLPIP Releases Report on Wired and Wireless Lighting Controls
NLPIP Releases Report on Wired and Wireless Lighting Controls The National Lighting Product Information Program (NLPIP) at Rensselaer Polytechnic Institute’s Lighting Research Center (LRC) recently released its latest publication, Lighting Answers: Comparison of Wired and Wireless Lighting Controls for Single Rooms. Read more »
Technologies | Thermal Management | Jun 24, 2015
Litecool Turns LED Packaging on Its Side
Litecool Turns LED Packaging on Its Side Litecool has produced LED packages in a vertical orientation rather than horizontal. This means that the dielectric layers only have a minor impact on the thermal performance of the LED package and allow the heat to escape more effectively through the metallic parts of the package. This has significant benefits for flip-chip packaging where dielectric layers are usually very close to the diode. Read more »
Resources | Roadmap | DoE | Technologies | SSL | Jun 15, 2015
DoE: Solid-State Lighting R&D Plan
The solid-state lighting (SSL) revolution signals a profound shift in how we will use and consider lighting and represents a huge opportunity to generate significant energy savings. The energy being used for lighting represents a significant portion of global energy use. Rising electricity prices, mounting concerns about climate change, and desire for energy independence are causing the global lighting market to shift toward more energy-efficient light sources. Read more »
White Paper | Technology | May 27, 2015
BluGlass Demonstrates Improved Performance Results for Green RPCVD Manufactured p-GaN LEDs
BluGlass Demonstrates Improved Performance Results for Green RPCVD Manufactured p-GaN LEDs BluGlass has succeeded in its initial experimentation of applying low temperature RPCVD p-GaN to Green LED applications with highly promising results. These results show that the green LEDs produced using RPCVD p-GaN are demonstrating greater efficiency than the BluGlass grown MOCVD benchmark LEDs using the exact same MOCVD grown multi-quantum wells (MQWs), the critical light emitting region of an LED device. Read more »
Technologies | Electronics | May 27, 2015
Power Conversion Efficiency - Key for Stand-Alone Solar Powered Lighting in Nordic Regions
Power Conversion Efficiency - Key for Stand-Alone Solar Powered Lighting in Nordic Regions Stand-alone solar powered lighting solutions are made possible even in the Nordic region through a new, ground-breaking Danish project. An ideal collaboration between scientists from 4 different fields and private companies has succeeded in creating a system and a methodology that makes the impossible possible: Outdoor solar lighting which is not just a decoration. Read more »
Technologies | Optics | Material Science | May 12, 2015
ORNL Superhydrophobic Glass Coating Offers Clear Benefits - Maybe Also for Lighting Optics
ORNL Superhydrophobic Glass Coating Offers Clear Benefits - Maybe Also for Lighting Optics A moth’s eye and lotus leaf were the inspirations for an antireflective water-repelling, or superhydrophobic, glass coating that holds significant potential for solar panels, lenses, detectors, windows, weapons systems and many other products. The discovery by researchers at the Department of Energy’s Oak Ridge National Laboratory, detailed in a paper published in the Journal of Materials Chemistry C, is based on a mechanically robust nanostructured layer of porous glass film. The coating can be customized to be superhydrophobic, fog-resistant and antireflective. Read more »
Technology | May 04, 2015
Configuration Via the Mains: Simple, Reliable and Professional
Configuration Via the Mains: Simple, Reliable and Professional As the heart of any LED luminaire, the LED driver not only has to meet strict requirements in terms of quality and reliability but also be flexible enough to adapt to different conditions. ready2mains – a new technology from Tridonic – helps enormously. The article explains what is needed and how it works. Read more »
White Paper | Technology | Mar 30, 2015
TRIAC Dimmable, Isolated LED Driver with High Power Factor Needs No Opto-Isolators
TRIAC Dimmable, Isolated LED Driver with High Power Factor Needs No Opto-Isolators As environmental concerns over traditional lighting in-crease and the price of LEDs decreases, high power LEDs are fast becoming a popular lighting solution for offline applications. In order to meet the requirements of offline lighting - such as high power factor, high efficiency, isolation and TRIAC dimmer compatibility - prior LED drivers used many external discrete components, resulting in cumbersome solutions. By Wei Gu Applications Engineering Section Leader at Linear Technology demonstrates how new solutions reduce complexity while improving performance. Read more »
White Paper | Technology | Feb 16, 2015
Osram Improves Efficiency of Blue LED Chips by Reducing Forward Voltage
Osram Improves Efficiency of Blue LED Chips by Reducing Forward Voltage Osram Opto Semiconductors has achieved one of the best values in the world in terms of forward voltage for blue high-current chips. This has led to an increase in efficiency of up to eight percent. Optimized InGaN chips (Indium-Gallium-Nitride) featuring UX:3 chip technology are the basis for blue or white LEDs – and are already used in production. Osram experts also see considerable potential for reducing the value by a further 20 to 30 millivolts (mV) by the summer of 2015 – offering a further boost in efficiency. Read more »
White Paper | Technology | Feb 05, 2015
Universities Develop Novel LEDs by Band-Structure Engineering in van der Waals Heterostructures
Universities Develop Novel LEDs by Band-Structure Engineering in van der Waals Heterostructures Semi-transparent, flexible electronics are no longer just science-fiction thanks to graphene’s unique properties, University of Manchester researchers have found. Published in the scientific journal Nature Materials, University of Manchester and University of Sheffield researchers show that new 2D ‘designer materials’ can be produced to create flexible, see-through and more efficient electronic devices including semi-transparent LEDs. Read more »
White Paper | Technology | Jan 15, 2015
Ending the Invisible Threat - Confronting the LED Flickering Issue
Ending the Invisible Threat - Confronting the LED Flickering Issue One of the topics in 2014 International LIGHTFAIR DOE training was “SSL Flicker Fundamentals and Why We Care“ (Michael Poplawski and Naomi Miller 2014),this reignited the industry’s discussion on light modulation. This topic was already raised by ASSIST earlier, where research on human’s level of tolerance to high-frequency flickers have been done and published in several lighting magazines by Rebekah Mullaney, hoping to encourage LED manufacturers and distributors to put more emphasis on finding a permanent solution that is more suitable for people’s well-being. - Andy Fei and Nina Chen from ALT-LED summarize these flicker research results and explain how to avoid flicker issues. Read more »
White Paper | Technology | Jan 09, 2015
Compute Simulation Sheds Light On Why Blue LEDs Are So Tricky To Make
Compute Simulation Sheds Light On Why Blue LEDs Are So Tricky To Make Researchers in our Department of Chemistry have collaborated with groups at University College London (UCL) and Daresbury to uncover the mystery of why blue light-emitting diodes (LEDs) are so difficult to make, by revealing the complex properties of their main component – gallium nitride – using sophisticated computer simulations. Read more »
White Paper | Technology | Jan 09, 2015
LpS 2014 Scientific Award Winner Article: New Binning Strategy for White LEDs
LpS 2014 Scientific Award Winner Article: New Binning Strategy for White LEDs After having recognized the deficiencies of the ANSI binning strategy, which is based on the visually false magnification of MacAdam’s ellipses, Dr. Peter Bodrogi and Prof. Tran Quoc Khanh from the Technical University Darmstadt propose a new binning strategy based on a so-called semantic interpretation to describe and easily communicate the magnitude of acceptable chromaticity differences. Read more »
Resources | Reports | Market | Technologies | OLEDs | Dec 11, 2014
Research and Markets Announces OLED Lighting Opportunities 2015-2025 Forecast
Research and Markets Announces OLED Lighting Opportunities 2015-2025 Forecast OLED lighting is an emerging solid-state lighting technology. It potentially provides a route into the large and growing global lighting market. The lighting market is however complex as it is a highly fragmented space thanks to the existence of a broad technology mix and a diversity of customer needs. Read more »
White Paper | Technology | Nov 21, 2014
Thermoresponsive PDLC Coating for Smart CCT-Tunable LED Applications
Thermoresponsive PDLC Coating for Smart CCT-Tunable LED Applications When the 2014 Nobel Prize in physics was awarded this October to three Japanese-born scientists for the invention of blue light emitting diodes (LEDs), the prize committee declared LED lamps would light the 21st century. Now researchers from the Netherlands propose a novel way to ensure the lights of the future not only are energy efficient but also emit a cozy warmth. Cornelissen and his colleagues from the Eindhoven University of Technology, Netherlands describe their new LEDs in a paper published in The Optical Society's (OSA) open-access journal Optics Express. Read more »
Technology | Nov 06, 2014
Osram Reports Record Figures for Green InGaN-Based and Conversion LEDs
Osram Reports Record Figures for Green InGaN-Based and Conversion LEDs The “Hi-Q-LED” project funded by Germany’s Federal Ministry of Education and Research (BMBF) has made pioneering advances with green LEDs, greatly diminishing what is known as the “green gap” phenomenon – the significant drop in efficacy in the green spectral range. The result is a green-emitting LED based on indium gallium nitride (InGaN) semiconductors which achieves a record efficacy of 147 lumens per watt (lm/W) at a wavelength of 530 nanometers (nm) and a spectral width of 35 nm. In addition, another green LED developed by combining a blue chip with a phosphor converter has achieved a record-breaking efficacy exceeding 200 lm/W. Read more »
Technology | Oct 07, 2014
And the Nobel Price 2014 Goes To ... The Inventors of the Blue LED
And the Nobel Price 2014 Goes To ... The Inventors of the Blue LED The Royal Swedish Academy of Sciences has decided to award the Nobel Prize in Physics for 2014 to Isamu Akasaki from the Meijo University, Nagoya, Japan and Nagoya University, Japan, to Hiroshi Amano from the Nagoya University, Japan and to Shuji Nakamura from the University of California, Santa Barbara, CA, USA for the invention of efficient blue light-emitting diodes which has enabled bright and energy-saving white light sources. Read more »
Technology | Sep 25, 2014
Nanotechnology May Lead to Better, Cheaper LEDs
Nanotechnology May Lead to Better, Cheaper LEDs Princeton University researchers have developed a new method to increase the brightness, efficiency and clarity of LEDs, which are widely used on smartphones and portable electronics as well as becoming increasingly common in lighting. Using a new nanoscale structure, the researchers, led by electrical engineering professor Stephen Chou, increased the brightness and efficiency of LEDs made of organic materials (flexible carbon-based sheets) by 57 percent. The researchers also report their method should yield similar improvements in LEDs made in inorganic (silicon-based) materials used most commonly today. Read more »
Technology | Sep 18, 2014
LpR 44 Article: Discomfort Glare Perception of Non-Uniform Light Sources in an Office Setting
LpR 44 Article: 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. Read more »
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