Resources Archive

White Paper | Products, Materials + Tools | Feb 11, 2014
WHITE PAPER: "LED Reflector and Lens Simulation using TracePro® Illumination Design and Analysis Software"
WHITE PAPER: "LED Reflector and Lens Simulation using TracePro® Illumination Design and Analysis Software" 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
WHITE PAPER: Intelligent Over Temperature Protection for LED Lighting Applications
WHITE PAPER: Intelligent Over Temperature Protection for LED Lighting Applications 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 | Dec 11, 2013
The Right Choice of Current-Limiting Resistors for Constant Voltage LED Drivers
The Right Choice of Current-Limiting Resistors for Constant Voltage LED Drivers 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
LED Lighting Masters the Art of In-Flight Calm on Airbus A380s and Boeing 787s 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 | IP, Reports & Roadmaps | Oct 28, 2013
DOE Publishes Report on Color Stability of LED Lighting Products
DOE Publishes Report on Color Stability of LED Lighting Products 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 08, 2013
Two-Switch Flyback Solution for LED Street Lighting
Two-Switch Flyback Solution for LED Street Lighting 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?
Why Pin Fin LED Coolers Perform Better Under Tilted Position? 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
New Comprehensive Investigation on LED Phosphors and Down-Converters Patents 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 | IP, Reports & Roadmaps | Jul 31, 2013
DoE Publishes CALiPER Snapshot Report on Outdoor Area Lighting
DoE Publishes CALiPER Snapshot Report on Outdoor Area Lighting The U.S. Department of Energy's CALiPER program has released a Snapshot Report on outdoor area lighting, 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 LED outdoor area and roadway, parking garage, and canopy luminaires. Read more »
White Paper | Jul 02, 2013
Alternative Calculation Method Will Improve Thermal Analysis of LEDs - by Michiel Krüger, Ph.D. - Philips Lumileds
Alternative Calculation Method Will Improve Thermal Analysis of LEDs - by Michiel Krüger, Ph.D. - Philips Lumileds An alternative method to estimate the amount of heat generated by LEDs will help increase the accuracy and streamline the thermal analysis of white LEDs. Up until now, thermal analysis of white LEDs has been an imperfect science. Too often LED lamp and luminaire manufacturers rely on insufficient, inaccurate or intangible data to determine the thermal performance of the LEDs in their applications, and, as a result, may over-engineer their heat sink design. Read more »
White Paper | IP, Reports & Roadmaps | Jan 03, 2013
DoE Releases CALiPER 2012 Year in Review Report
DoE Releases CALiPER 2012 Year in Review Report The CALiPER program has tested more than 500 products since its inception in 2006, revealing a variety of performance trends, holding manufacturers accountable for claims, and identifying concerns that limit adoption. Over the past six years, the LED marketplace has changed substantially; previously relegated to niche status, LED products are now a viable alternative in many product categories and market share is expected to grow rapidly. Starting in 2012, Summary Reports focus on a single product type or application. Read more »
White Paper | Technology | Oct 10, 2012
Fan Efficiency, An Increasingly Important Selection Criteria
Fan Efficiency, An Increasingly Important Selection Criteria How important is fan efficiency in the selection of a cooling system? Selecting a cooling fan is no longer about airflow and noise. The true test for a design engineer is the understanding that by selecting an efficient cooling fan system savings in cost of ownership can be realized. NMB Technologies Corporation, a Minebea Group Company, has released a new white paper on that issue. Read more »
White Paper | IP, Reports & Roadmaps | Mar 28, 2012
DOE Releases GATEWAY Report on Museum LED Retrofit Lighting
DOE Releases GATEWAY Report on Museum LED Retrofit Lighting The U.S. Department of Energy (DOE) has published the final evaluation report from a retrofit of track lighting used to illuminate a special photography exhibition at the J. Paul Getty Museum in Malibu, California. During the demonstration, 12W LED PAR 38 lamps replaced 60W halogen PAR 38 30° flood lamps on a one-for-one basis across three adjacent gallery spaces. Read more »
White Paper | IP, Reports & Roadmaps | Mar 13, 2012
Research and Markets Releases "Smart Lighting 2012" Report
The Research and Markets report provides an analysis of the worldwide smart lighting market and builds on NanoMarkets’ extensive six-year experience of analyzing the solid-state lighting industry. The report shows how new value is being created in the lighting market by adding enhanced electronics and intelligent luminaires and how such product strategies will be able to build on the massive trend towards introducing CFLs, LEDs, OLEDs and other forms of energy efficient lighting. Read more »
IP, Reports & Roadmaps | Feb 28, 2012
DOE Releases Life-Cycle Energy Consumption Report - Incandescence vs. Fluorescent vs. LED Lamps
DOE Releases Life-Cycle Energy Consumption Report - Incandescence vs. Fluorescent vs. LED Lamps The U.S. Department of Energy (DOE) has published a report comparing the energy consumed over the entire life cycle for LED lamps, compact fluorescent lamps (CFLs), and incandescent lamps. Entitled "Review of the Life-Cycle Energy Consumption of Incandescent, Compact Fluorescent, and LED Lamps", it is based on existing life-cycle assessment literature of lighting products. Read more »
IP, Reports & Roadmaps | Feb 01, 2012
Energy Savings Potential of Solid-State Lighting in General Illumination Applications
Energy Savings Potential of Solid-State Lighting in General Illumination Applications The U.S. Department of Energy (DOE) has developed a comprehensive strategy to accelerate the development and market introduction of energy-efficient solid-state lighting for general illumination. The energy savings potential of this technology is significant, and the U.S. will benefit by focusing our resources and maintaining our global leadership in this technology. The latest report forecasts the energy savings potentiol due to LED technology. Read more »
IP, Reports & Roadmaps | Jan 24, 2012
DOE Report Characterizes 2010 US Lighting Market
DOE Report Characterizes 2010 US Lighting Market The U.S. Department of Energy (DOE) has released a report detailing the characteristics of the U.S. lighting market by technology and sector, which helps chart progress made toward the goal of transitioning to more efficient white-light source technologies. The 2010 U.S. Lighting Market Characterization provides comprehensive and detailed estimates of the national inventory of installed lamps as well as their performance characteristics, associated energy use, and lumen production. It focuses on four sectors: residential buildings, commercial buildings, industrial buildings, and outdoor. Read more »
White Paper | IP, Reports & Roadmaps | Jan 11, 2012
DOE Releases Consortium Report on LED Street Lights
The U.S. Department of Energy (DOE) has published the final report from a demonstration of LED technology in ornamental post-top street lights, conducted in Sacramento, CA. This report provides an overview of the evaluation of four different LED replacement products using computer simulations, field measurements, and laboratory testing. The evaluation was conducted by DOE’s Municipal Solid-State Street Lighting Consortium in collaboration with the Sacramento Municipal Utility District and the City of Sacramento, with additional support from City consultant Mary Matteson Bryan. Read more »
IP, Reports & Roadmaps | Aug 11, 2011
SEMI Releases China LED Fab Industry Report
SEMI has announced the release of a new report, The China LED Fab Industry Report, which provides a comprehensive summary on the rapidly-growing China LED industry, including the latest data on capital and equipment spending, fab capacity, sales rankings of Chinese LED manufacturers, and other valuable information. The report also includes an update on the subsidy incentives for China fab projects, an update on new LED fab projects, an overview of Chinese sapphire wafer suppliers, and company profiles of the leading Chinese manufacturers. Read more »
IP, Reports & Roadmaps | Jul 21, 2011
DOE Publishes Updated Recommendations for Testing and Reporting LED Luminaire Lifetime
The U.S. Department of Energy (DOE) has published an updated version of the guide LED Luminaire Lifetime: Recommendations for Testing and Reporting, the latest edition in a series of publications on LED product performance and lifetime. The guide was developed by a working group under the auspices of DOE and the Next Generation Lighting Industry Alliance, composed of a diverse group of experts in reliability, lighting, and LED technology. Their recommendations are an important step toward consistent, industry-wide understanding of LED luminaire lifetime, and will assist standards organizations in their work. Read more »
IP, Reports & Roadmaps | May 12, 2011
DOE Publishes Updated SSL R&D Plan
DOE Publishes Updated SSL R&D Plan The U.S. Department of Energy has published an updated version of the March 2011 edition of the Solid-State Lighting (SSL) R&D Multi-Year Program Plan (MYPP). The report provides a description of the activities the Department plans to undertake over the next several years to implement its SSL mission, and informs the development of annual SSL R&D funding opportunities. Read more »
IP, Reports & Roadmaps | Feb 15, 2011
UCI Researchers Find LED Products Billed as Eco-Friendly Contain Toxic Metals
LED products usually are electronic products that should be handled as electronics scrap if disposed, anyway. A realease of potentially hazardous substances under regular use is very unlikely, even when broken. LED professional does not agree with the generalized conclusions of this research. However, it is important to challange statements of PR and lobbies to boost more eco-friendly products. In fact, light-emitting diodes of tested holiday bulbs, traffic lights and car beams marketed as safe, environmentally preferable alternatives to traditional lightbulbs actually contain lead, arsenic and a dozen other potentially hazardous substances, according to newly published research. Read more »
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