White Paper | Standardization + Regulation | Dec 03, 2013

The Connected Lighting Alliance Extends Scope to Indoor Professional Lighting

The Connected Lighting Alliance aims to define and endorse standards of wireless lighting controls for different applications Following its endorsement of ZigBee Light Link as the preferred common open standard for residential connected lighting applications, The Connected Lighting Alliance announced today the launch of a new initiative focused on the indoor professional lighting market. The Alliance will analyze market requirements for indoor professional lighting applications and identify standard development organizations to engage with. As an open association, the Alliance invites interested companies to join the industry initiative and share their expertise in this field. The contribution of multiple companies in the lighting industry will greatly benefit the global adoption of wireless lighting solutions. Read more »

White Paper | Standardization + Regulation | Dec 03, 2013

The Connected Lighting Alliance Extends Scope to Indoor Professional Lighting

The Connected Lighting Alliance aims to define and endorse standards of wireless lighting controls for different applications Following its endorsement of ZigBee Light Link as the preferred common open standard for residential connected lighting applications, The Connected Lighting Alliance announced today the launch of a new initiative focused on the indoor professional lighting market. The Alliance will analyze market requirements for indoor professional lighting applications and identify standard development organizations to engage with. As an open association, the Alliance invites interested companies to join the industry initiative and share their expertise in this field. The contribution of multiple companies in the lighting industry will greatly benefit the global adoption of wireless lighting solutions. Read more »

White Paper | Standardization + Regulation | Nov 14, 2013

Zhaga Publishes Book 7 and Book 8 Interface Specifications for LED Light Engines

Zhaga Logo Two more interface specifications for LED light engines have been published by the Zhaga Consortium. Zhaga is an international organization that is enabling the interchangeability of LED light sources made by different manufacturers. The interface specifications, designated Book 7 and Book 8, can now be downloaded from the Zhaga website . Read more »

White Paper | Standardization + Regulation | Nov 14, 2013

Zhaga Publishes Book 7 and Book 8 Interface Specifications for LED Light Engines

Zhaga Logo Two more interface specifications for LED light engines have been published by the Zhaga Consortium. Zhaga is an international organization that is enabling the interchangeability of LED light sources made by different manufacturers. The interface specifications, designated Book 7 and Book 8, can now be downloaded from the Zhaga website . Read more »

White Paper | Technology | Nov 04, 2013

UC Santa Barbara: Optimizing Phosphors Using Simple Guidelines Improves Efficiency of Solid-State Lighting

This illustration demonstrates how bright blue LED light, shone through its complementary yellow phosphor, yields white light By determining simple guidelines, researchers at UC Santa Barbara's Solid State Lighting & Energy Center (SSLEC) have made it possible to optimize phosphors –– a key component in white LED lighting –– allowing for brighter, more efficient lights. Read more »

White Paper | IP, Reports & Roadmaps | Oct 28, 2013

DOE Publishes Report on Color Stability of LED Lighting Products

Chromaticity over time for a subset of the lamps. When intermediate points are shown, the color shift appears unpredictable (a). Δu'v' for the best and worst performing lamps (b). Baseline and final (25,000-hour) chromaticity coordinates for each lamp sample (c). Initial and final chromaticity of lamps tested by CALiPER in 2008–2010 (d) The U.S. Department of Energy (DOE) has published a new report, Color Maintenance of LEDs in Laboratory and Field Applications. Although concern for parametric failure of LED lighting products has largely been focused on lumen maintenance, color shift is a cause of early failure for some products, especially in applications where visual appearance is critical. Read more »

White Paper | Technology | Oct 28, 2013

Los Alamos National Laboratory Announces Dramatic Improvements in QD Technology

Postdoctoral researcher Young-Shin Park characterizing emission spectra of LEDs in the Los Alamos National Laboratory optical laboratory. Inset: The quantum dot device structure shown with a transmission electron microscopy (TEM) image of a cross-section of a real device Dramatic advances in the field of quantum dot light emitting diodes (QD-LEDs) could come from recent work by the Nanotechnology and Advanced Spectroscopy team at Los Alamos National Laboratory. Read more »

White Paper | Technology | Oct 23, 2013

Latest LRC Program Aims to Fine Tune Light for Greenhouse Crops & Medicinal Plants

Light and plants expert Tessa Pocock, Ph.D., recently joined the Lighting Research Center (LRC) at Rensselaer Polytechnic Institute as a senior research scientist, leading the development of a new plant physiology lighting program. Her research focuses on plant photosynthesis, and plant development and regulation by light for traditional greenhouse crops and the emerging field of medicinal plants. Read more »

White Paper | Technology | Oct 08, 2013

Two-Switch Flyback Solution for LED Street Lighting

Won-Seok Kang has worked for Fairchild Semiconductor since 2006 and is currently an Industrial Senior Application Engineer for Fairchild’s Switch Mode Power Supply in the Power Conversion Division located in Korea. His research interests are in functional power module, LED drivers, resonant and soft switching dc/dc converters, and electronic ballast. He has a B.S. and M.S. degree in electronics engineering LEDs provide high efficiency and long life compared to conventional lighting sources. Therefore, they are becoming first priority of lamp types to reduce energy consumption for internal or external lighting. This is also the case in street lightings where better efficiency and longer life are essential for less cost. A switching power supply designed to power up LED lamp should also have high efficiency and robustness to assure maintenance free lifetime as long as LED lamp. Resonant converters are one of the most popular power supply topologies here since their performance delivers increased power efficiency. LLC resonant converter has drawn attention thanks to its features such as high power conversion efficiency and low voltage stress on secondary rectifier. However, complicated design and high manufacturing cost of LLC resonant converters have been obstacles to fast time-to-market and cost reduction. Another problem of LLC resonant converter is large circulating current that is required to maintain zero voltage switching (ZVS). It causes relatively high power consumption at light load. LLC resonant converter also has potential failure issue when MOSFET with poor body diode performance is used. Two-switch flyback converter is proposed as an alternative solution to overcome the limitations of the LLC resonant converter. With additional switch on the high side, leakage inductance energy is clamped and recycled back to input to improve efficiency. The dissipative snubber circuit is no longer needed. A 120W rated switching power supply is designed utilizing two-switch flyback topology. The details of design specification and test results are presented. Read more »

White Paper | Technology | Oct 08, 2013

Why Pin Fin LED Coolers Perform Better Under Tilted Position?

For passive cooling, both, simulation and measurement results demonstrate the advanages of a pin fin design over conventional fins when tilted more than 50° For the experiment we compare the ModuLED 9980 with the LPF11180-ZHE. The ModuLED 9980 is a passive LED cooler from extruded aluminium with a diameter. of 99mm and a height of 80 millimeter, thermal resistance under vertical position 1.02°C/W. The LPF11180-ZHE is a passive LED cooler with pin fin structure with a diameter of 111mm and a height of 80mm, thermal resistance under vertical position 1.07°C/W. Read more »

White Paper | IP, Reports & Roadmaps | Sep 12, 2013

New Comprehensive Investigation on LED Phosphors and Down-Converters Patents

Basic phosphor respectively light conversion IP licensing structure Yole Développement announces its new market & technology patent investigation, LED Phosphors and Down-Converters. Hundreds of companies are involved in LED phosphor IP. Most of the major LED players are present in the list of the top patent assignees. But independent phosphor manufacturers are also emerging as major forces in the IP landscape. Read more »

White Paper | Technology | Sep 04, 2013

Imec and Veeco Announce Collaboration in GaN-on-Si Devices for LED and Power Electronics Applications

Goal of imec's multi-partner GaN-on-Si research and development program is the development of GaN LED on 200 mm silicon substrates with CMOS-compatible infrastructure Nanoelectronics research centre imec of Belgium and Veeco Instruments Inc. (Nasdaq:VECO) are collaborating on a project aimed at lowering the cost of producing gallium nitride on silicon (GaN-on-Si) -based power devices and LEDs. Read more »

White Paper | Technology | Aug 28, 2013

PI's New Reference Design, DER-350 for PAR38 LED Spotlight, Promises Excellent Dimming Performance with TRIAC Dimmers

Power Integration DER350 schematic (top) and the populated circuit board photograph (left: Top View; right: Bottom View) Power Integrations, the leader in high-efficiency, high-reliability LED driver ICs, today announced a reference design for a dimmable PAR38 spotlight, developed in collaboration with Cree, Inc., a leading LED lighting company. The new reference design, described in DER-350, uses Power Integrations’ new LYT4317E, a member of the company’s LYTSwitchTM-4 family of single-stage drivers, along with Cree’s MT-G2 EasyWhite® LEDs. Read more »

White Paper | IP, Reports & Roadmaps | Aug 26, 2013

Sharp and OSRAM Enter into LED and Laser Diode Patent Cross-Licensing Agreement

Sharp Corporation (head office: Osaka City, Osaka Prefecture; President: Kozo Takahashi; below "Sharp") and OSRAM GmbH (head office: Munich, Germany; CEO: Wolfgang Dehen; below "OSRAM") have entered into a patent cross-licensing agreement covering LEDs (light-emitting diodes) and laser diodes. Read more »

White Paper | Technology | Jul 31, 2013

Rensselaer Researchers Identify Cause of LED “Efficiency Droop”

Voltage at the onset of high injection and voltage at the onset of the efficiency droop (i.e., the peak-efficiency point) as a function of temperature Rensselaer Polytechnic Institute researchers have identified the mechanism behind a plague of LED light bulbs: a flaw called “efficiency droop” that causes LEDs to lose up to 20 percent of their efficiency as they are subjected to greater electrical currents. Efficiency droop, first reported in 1999, has been a key obstacle in the development of LED lighting for situations, like household lighting, that call for economical sources of versatile and bright light. Read more »

FEATURED

Emergency Lighting Just Got Smarter

Emergency Lighting Just Got Smarter NEW NOW: OSRAM’s standalone solution for emergency lighting testing, reporting and maintenance. Meet the QBM DALI EL-T CONV, a converter transforming existing DALI emergency luminaires into wireless ones, all controlled by the same lighting system. Its benefits? Allowing you to design all the ... Read more »

FEATURED

Continuous versus Discrete Calibration Sources: Consideration for Use

Continuous versus Discrete Calibration Sources: Consideration for Use Rapid advancements in the field of solid-state lighting have presented opportunities for the use of LED-based systems for calibrations typically performed with lamp-based sources. Their highly efficient and long-lived performance, rapid power up, and compact size have made LED-based sources an ... Read more »

FEATURED

LUXTECH Offers First Compelling Flex Modules Designed to Replace Traditional Rigid Modules: LUXroll (UL Listed)

LUXTECH Offers First Compelling Flex Modules Designed to Replace Traditional Rigid Modules:  LUXroll (UL Listed) The Indirect Costs of Using Rigid Boards Make Switching to Flexible LED Modules a Compelling Choice. Read more »

EDITORIAL

New LUXEON Rubix Cyan LED Enables 96-98 CRI Across CCT Range in Color Driven Solutions for Entertainment, Stage, and Studio

New LUXEON Rubix Cyan LED Enables 96-98 CRI Across CCT Range in Color Driven Solutions for Entertainment, Stage, and Studio Lumileds added cyan, its eighth color, to the LUXEON Rubix high-power LED family enabling multi-color driven systems to produce very high CRI white light that is so important in entertainment lighting. Adding the cyan LED fills a significant wavelength gap between blue and green in a system and ... Read more »

EDITORIAL

New date: Light + Building Autumn Edition 2022

New date: Light + Building Autumn Edition 2022 Frankfurt am Main, January 10, 2022. As the pandemic situation continues to develop very dynamically, Messe Frankfurt is postponing the world's leading trade fair for light and building technology to autumn 2022. Last December, intensive discussions with customers and cooperation partners had ... Read more »

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