IP, Reports & Roadmaps | Jun 16, 2014

DOE Training Session Presentations from LIGHTFAIR International 2014

DoE Training Session Presentations Once again, DOE hosted its award-winning informational booth and free training sessions at LIGHTFAIR® International, held June 3–5 in Las Vegas. The LFI "Best Booth" in 2012 had new features for 2014, including expanded training sessions on specifying and using LED products, expert Q&A on today's toughest lighting issues, and touchscreen kiosks for drilldown details on DOE resources. Read more »

IP, Reports & Roadmaps | Jun 16, 2014

Lighting Research Center Authors National Academies Report on New Roadway Lighting Technologies

The rapid development of lighting technologies, particularly solid-state systems using light emitting diodes (LEDs), has opened a universe of new possibilities as well as new questions about roadway lighting in the U.S., which for decades has been dominated by the use of high pressure sodium (HPS) lamps. Other light source technologies have also been angling for roadway market share. There is a critical need for objective technical information about new types of roadway lighting among transportation agencies. In response, the Transportation Research Board (TRB), part of the National Academies, initiated a project to evaluate new lighting technologies and identify new metrics for comparison. Lighting Research Center (LRC) scientists John Bullough, who served as principal investigator, and Leora Radetsky co-authored the report, entitled "Analysis of New Highway Lighting Technologies." The LRC is part of Rensselaer Polytechnic Institute, the nation’s oldest technological research university. Read more »

IP, Reports & Roadmaps | Jun 16, 2014

DOE Publishes CALiPER Snapshot Report on Indoor LED Luminaires

The U.S. Department of Energy's CALiPER program has released a Snapshot Report on indoor LED luminaires, which utilizes the LED Lighting Facts® program's extensive product database to help industry stakeholders understand the current state and trajectory of the market for that class of products. Based on data through the first quarter of 2014, the report focuses on five types of indoor luminaires: downlights, industrial ambient luminaires (e.g., high-bay and low-bay), track heads, troffers (e.g., 2×4, 2×2, 1×4), and linear fixtures (e.g., linear pendants, strip lights). Together, these five product types represent the bulk of all indoor luminaires listed by LED Lighting Facts, and about one-third of the total products listed. Read more »

White Paper | IP, Reports & Roadmaps | Mar 20, 2014

Yole Développement's GaN-on-Si Report Forecasts Future of power Electronics and LEDs

Voltage and current requirements for different applications and the GaN-on-Si power device development status at the present time Yole Développement releases this week the GaN-on-Si Substrate Technology and Market for LED and Power Electronics report. Under this report, Yole Développement reviews the GaN-on-Si technology growth, challenges and solutions. Dr Hong Lin and Dr Eric Virey, Yole Développement’s analysts give an overview of GaN-on-Si epiwafer playground. This report also provides an in-depth analysis of the GaN-on-Si technology for LED and power electronic applications, including technology and cost aspect. Yole Développement’s analysts, both develop possible business models for the adoption of GaN-on-Si technology. GaN-on-Si substrate technology and market for LED and Power Electronics report also includes market volume and revenue forecast to 2020. Read more »

Fundings & Projects | White Paper | Feb 13, 2014

New Research Initiative: LASSIE-FP7 To Develop LED-Based Modules for Professional and Architectural Lighting

CSEM announces the launch of LASSIE-FP7, a research project funded by the European Commission to develop a unique integrated solid-state module that will constitute a breakthrough in professional and architectural lighting. Read more »

White Paper | Products, Materials & Tools | Feb 11, 2014

WHITE PAPER: "LED Reflector and Lens Simulation using TracePro® Illumination Design and Analysis Software"

Luxeon LED as modeled as a surface source using the Tracepro Bridge in SolidWorks TracePro® is award-winning opto-mechanical design software for layout, optimization, & analysis of illumination systems. This white paper illustrates how TracePro allows users to begin a project with an initial or basic design for LED lighting systems, use software simulation prior to building hardware, and easily create complex reflector shapes. TracePro’s reflector and lens simulation utilities are specifically designed to help CAD designers without traditional optical engineering expertise design LED optical components quickly. Read more »

White Paper | Technology | Dec 11, 2013

The Right Choice of Current-Limiting Resistors for Constant Voltage LED Drivers

There are different resistor types for LED lighting available (Img: Riedon Inc) While LEDs are mostly driven by current sources, there are also several applications where constant voltage drivers are used. In that case current limiting resistors are mandatory. But that raises the question which resistor is the right one to guarantee reliable and accurate control while not compromising efficiency. Phil Ebbert, VP of Engineering at Riedon Inc. explains what to take care of and how to determine the correct parameters. Read more »

White Paper | Lighting Applications | Dec 06, 2013

LED Lighting Masters the Art of In-Flight Calm on Airbus A380s and Boeing 787s

A380 Airbus Cabin Aboard a state-of-the-art aircraft might be the last place you would think of yourself enjoying a warm “candlelit” dinner, followed by a good night’s sleep under a starry night sky. The truth is, the latest aircraft cabins seek to provide just that – a revolutionary in-flight experience through the use of mood lighting. Mood lighting uses the full spectrum of colors and the ability to change these colors continuously with LEDs to mimic or enhance a sunrise morning or a bright, fresh afternoon or a cool evening that winds down the day. These lighting effects even seek to reduce your likelihood of jetlag. LED lighting programs can be specifically designed to gradually shift your waking and sleeping biorhythms to match that of your destination city. 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 | 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 »

Standardization & Regulation | Oct 12, 2013

Zhaga Specifications Reference NEMA Standard for LED Dimming

Zhaga Logo NEMA’s LED dimming standard SSL 7A-2013 has been referenced by two Zhaga interface specifications for LED light engines. 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 »

EDITORIAL

EuControls Introduces Its Zigbee Compatible Ceiling Mount Multi-Sensor 810-PLT-DZB

EuControls Introduces Its Zigbee Compatible Ceiling Mount Multi-Sensor 810-PLT-DZB EuControls is excited to announce the addition of a compact ceiling mount multi-sensor/controller to its growing wireless lighting controls product portfolio. The S810-PLT-DZB is a unique Zigbee compatible energy management device aimed at new and retrofit indoor lighting projects that require ... Read more »

EDITORIAL

Selecting the UV LED Wavelength for Purification Applications

Selecting the UV LED Wavelength for Purification Applications Patrick Durand is the Worldwide Technical Director at Future Lighting Solutions (FLS) with over 15 years of experience in the solid state lighting industry. Patrick leads the FLS Technical Marketing teams and FLS laboratory teams located in multiple regions around the world with the objective of ... Read more »

EDITORIAL

Nichia Showcases LEDs with 'Light so Good'

Nichia Showcases LEDs with 'Light so Good' At Light + Building 2020 held in Frankfurt, Nichia – the leader in high-performance LED solutions – reveals it will present at least three complementary technologies to improve the delivery of light quality under an over-arching banner of 'Light so Good'. Read more »