Business | Organization News | TALQ | White Paper | Aug 07, 2018

TALQ Consortium Releases a New White Paper

TALQ Consortium Releases a New White Paper The TALQ Consortium reveals in a White Paper published today many insights into its global interface standard and certification scheme for managing smart city applications including outdoor lighting networks. The document explains in detail not only the system architecture and data model, but also its functions and services. It helps cities, solution providers, project planners and other stakeholders understand the concepts and benefits of the Smart City Protocol. The full TALQ Specification Version 2.0 – allowing vendors to easily integrate the protocol in their systems - is available for TALQ member companies together with a powerful Test Suite. Read more »

White Paper | Technology | Jul 21, 2015

Litecool Demonstrates that Narrow Beam LED Packages Are a Real Possibility

Litecool have shown promising results for new LED package design that gives focused light beams with no secondary optics or reflectors Litecool has been working on various LED package designs to give luminaire manufacturers an LED package that doesn’t need any further lensing or reflectors to give the desired beam patterns for lighting applications. Read more »

White Paper | Technology | May 27, 2015

BluGlass Demonstrates Improved Performance Results for Green RPCVD Manufactured p-GaN LEDs

Green light emission from RPCVD p-GaN layers grown on MOCVD MQWs 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 »

White Paper | Technology | Mar 30, 2015

TRIAC Dimmable, Isolated LED Driver with High Power Factor Needs No Opto-Isolators

TRIAC Dimmable 20W Offline LED Driver Using the LT3799 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 17, 2015

The Future of More Efficient LEDs and Lasers Probably Starts in 2D

Researchers at The Ohio State University have developed a technique for making one-atom-thick sheets of germanium for eventual use in advanced electronics. Already in 2010, MIT's Material Research Group demonstrated the first germanium laser (Photo: Dominick Reuter/MIT) The future of electronics could lie in a material from its past, as researchers from The Ohio State University work to turn germanium - the material of 1940s transistors - into a potential replacement for silicon. Read more »

White Paper | Technology | Feb 16, 2015

Osram Improves Efficiency of Blue LED Chips by Reducing Forward Voltage

Osram experts have significantly reduced the value of the forward voltage, compared with the data sheet for the previous Osram Oslon Square 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

Schematic of the SQW heterostructure for graphene based, band-structure engineered LEDs 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 »

Fundings & Projects | White Paper | Jan 15, 2015

Holst Centre and Flex-o-Fab Take the First Step Towards "Lighting by the Mile"

Manufacturing flexible OLEDs using a R2R-process is crucial for reducing costs for coming down to an affordable price Researchers from the EU-funded Flex-o-Fab project have successfully fabricated working OLED devices on a flexible barrier layer produced in a roll-to-roll (R2R) process. Produced on a PET plastic film, this breakthrough is a significant first step towards taking flexible OLEDs ‘from lab to fab’ and hence to commercial production. It draws on technical developments achieved within both Flex-o-Fab and Holst Centre’s joint research program into high-performance flexible barriers for organic electronics. Read more »

White Paper | Technology | Jan 15, 2015

Ending the Invisible Threat - Confronting the LED Flickering Issue

Figure 5: The flicker comparison of lighting products (Sources: Michael Poplawski and Naomi Miller, ”SSL Flicker Fundamentals and Why We Care” - U.S Department of Energy, 2014) 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

LpS 2014 Scientific Award Winner Article: New Binning Strategy for White LEDs

Figure 1: Semantic contours for chromaticity differences from the chromaticity center in the CIE x,y chromaticity diagram for a warm white chromaticity center, the Planckian radiator at 2500 K; x=0.4770; y=0.4137 (light green dot). Going off the center in any direction, contours indicate “good-very good” (green contour), “good” (yellow contour), “moderate-good” (orange contour), “low” (red contour) and “bad” (lilac contour) perceived color agreement with the center. Contours of constant chromaticity differences (Δu’v’=0.001 - Δu’v’=0.007 i.e. approximations of MacAdam ellipses) measured from the chromaticity center are also shown 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 »

White Paper | Technology | Jan 09, 2015

Compute Simulation Sheds Light On Why Blue LEDs Are So Tricky To Make

New research from academics from the University of Bath Department of Chemistry has uncovered the mystery of why blue light-emitting diodes (LEDs) are so difficult to make: (1) Calculated spin density resulting from (a) a Mg0Ga-associated hole localized on a neighboring N in the basal plane, (b) a Mg0Ga-associated hole localized on a neighboring axial N, and (c) a N vacancy. Light gray (green) [darker gray (blue)] spheres represent Ga (N) atoms. The darkest gray sphere represents a Mg atom in (a) and (b) (purple) and a vacancy in (c) (orange). Spin densities are indicated by (red) isosurfaces of density (au) 0.05, 0.025, and 0.01 for (a) and (b) and 0.01, 0.005, 0.0025 for (c). (2) Formation energy of VN (black line) and MgGa [light gray (red) line] as a function of Fermi energy above the VBM. Anion-rich conditions are assumed. The position of the conduction band minimum (CBM) is indicated by the broken line. For each value of Fermi energy, only the most stable defect charge state is shown, with a change in slope indicating a change in charge state 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 | Standardization & Regulation | Dec 11, 2014

Zhaga Consortium Starts Work on New Specification for COB LED Arrays

Zhaga is now writing a Book on COB LED arrays In response to feedback from a broad range of stakeholders, the Zhaga Consortium, which develops specifications for interchangeable LED light sources, is now working on a new Book that will include Chip-on-Board (COB) LED arrays. The new Zhaga Book will specify a family of six rectangular or square LED modules with different dimensions. Read more »

White Paper | Technology | Nov 21, 2014

Thermoresponsive PDLC Coating for Smart CCT-Tunable LED Applications

Thermoresponsive scattering coating for smart CCT-changing white LEDs: a) basic working mechanism; b) demonstrator using coated (bottom) and uncoated (top) warm white LEDs operating at a low current (~20 mA/LED - top picture) and at a high current (~80 mA/LED - the bottom); c) associated CCT vs. current diagram 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 »

White Paper | Technology

WHITE PAPER: Intelligent Over Temperature Protection for LED Lighting Applications

Application circuit with the new ILD6070 driver: The current reduction is triggered at a threshold of the solder point temperature of the LED driver IC which is adjustable using an external resistor connected to the Tadj pin LED lighting is becoming increasingly popular. It offers numerous advantages over conventional lighting, but there are still some issues. One is thermal management. Bernd Pflaum and Hakan Yilmazer from Infineon Technologies explain how LED driver ICs with smart over temperature protection help to increase lifetime and optimize system costs of LED lighting systems. Read more »

White Paper | Technology | Aug 28, 2014

Osram Opto Demonstrates "3D nano LEDs" for White Light and Sees Series Maturity in Coming Years

Osram researchers make a 3D nano LED for white light shine on the wafer using two tiny, energized needles.The needles are pressed onto the contact surfaces of the chips, and the distance between the contact points corresponds approximately to the thickness of three sheets of stacked writing paper By making use of nanotechnology, Osram hopes to produce significantly more LED chips with its existing production plant. Osram researchers have for the first time succeeded in manufacturing a so-called "3D nano LED" for white light. The productivity boost is possible due to the special surface characteristics of the LED chip – in contrast to today's standard models, this is not smooth but consists of many adjacent, microscopically small columns with a three-dimensional structure, thus increasing its light-generating area. The new technology is expected to achieve series maturity in coming years, and Osram would then be one of the first companies to use this technology. Read more »

FEATURED

Simultaneous Measurement of Several Wavelength Ranges

Simultaneous Measurement of Several Wavelength Ranges Instrument Systems offers smart high-end solutions for complex spectral measurements that are to be made simultaneously over an extremely broad wavelength range, or over several samples. A group of spectroradiometers of the CAS series can be controlled in parallel by a trigger box. Read more »

FEATURED

Multisystem - Same Core, Multiple Shapes and Functionalities for Track Lighting

Multisystem - Same Core, Multiple Shapes and Functionalities for Track Lighting A.A.G. Stucchi low voltage system for track lighting is developed to satisfy all technical and design needs. The all system is based on a “smart core” that provides easy and magnetic installation of the lighting fixtures, and integrated databus for light control, thus being technically at the ... Read more »

FEATURED

Eyelove Healthy Lighting LED - New Updates

Eyelove Healthy Lighting LED - New Updates Last October, NATIONSTAR launched Eyelove brand of healthy lighting LED, which attracted wide attention from customers at home and abroad, and was favored by the market and recognized by the industry for its excellent performance. It has won many honors such as "the first batch of healthy lighting ... Read more »

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American Bright Optoelectronics Expands Its Family of IR Products to Cover Security, Remote Control, Appliance and Night Vision Applications

American Bright Optoelectronics Expands Its Family of IR Products to Cover Security, Remote Control, Appliance and Night Vision Applications American Bright has introduced the most complete family of discrete infrared (IR) products in the industry, expanding its 20-year global leadership in the remote control and sensing markets. Product selection includes through-hole, surface mount (SMT) and PLCC variants of the industries’ most ... Read more »

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Red XLamp LEDs Delivers Best-in-Class Horticulture Efficiency

Red XLamp LEDs Delivers Best-in-Class Horticulture Efficiency  Cree, Inc. announces the next-generation XLamp® XP-E2 Photo Red (660 nm) and Far Red (730 nm) LEDs, delivering breakthrough performance for horticulture applications. The new Red XP-E2 LEDs provide a drop-in upgrade for the previous generation that outperforms competing LEDs by up to 68 percent. ... Read more »

EDITORIAL

Well-Being, Light and Exhibition Lighting

Well-Being, Light and Exhibition Lighting Commentary from LpR 71: Well-being is the state of feeling healthy and happy, a good or satisfactory condition of existence, including the emotional and psychological sphere. In 1810, Goethe published a theory based on a human-based approach, combining visual appearance with harmony, culture, ... Read more »

EDITORIAL

High Conductive Foils Enabling Large Area Lighting

High Conductive Foils Enabling Large Area Lighting Fraunhofer Institute for Organic Electronics, Electron Beam and Plasma Technology FEP as one of the leading partners for research and development for surface technologies and organic electronics and Sefar AG, a leading manufacturer of precision fabrics from monofilaments, developed a roll-to-roll ... Read more »

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