LED professional Review (LpR) - Articles

LpR Article | Jul 20, 2016

Concept of a Time-Proven LED Luminaire Design and Manufacturing Process by Lumitec Lighting

Concept of a Time-Proven LED Luminaire Design and Manufacturing Process by Lumitec Lighting While doing successful business has always been a tough job, it has become even tougher with the introduction of solid-state technology into the lighting industry. Besides high quality criteria, time to market has become a crucial success factor. Innovative processes and tools and, last but not least, a talented and inspired team are necessary. Angela Betancourt presents an approved process used by Lumitec Lighting. Read more »

LpR Article | Technologies | Jul 18, 2016

Mastering Thermal Issues in LED PCB Design & Laminate Selection by Ventec Europe

Mastering Thermal Issues in LED PCB Design & Laminate Selection by Ventec Europe LED applications are not the only applications that are driving the need for thermal issues to be considered and mastered in PCB design, but they are certainly amongst the most challenging. Designing LED PCBs requires many considerations and key are those that arise from multiple heat sources in close proximity. Martin Cotton, Director OEM Technology of Ventec Europe describes the process and criteria used when designing PCBs (Printed Circuit Boards) for use in LED applications using thermally conductive IMS (Insulated Metal Substrates). He goes into technical detail with charts and diagrams that explain everything the designer would need to consider when selecting a laminate and commencing a design. Read more »

LpR Article | Jul 14, 2016

Light-Emitting Surface (LES) Concept Enables Comparison of Photometric Properties by Osram GmbH

Light-Emitting Surface (LES) Concept Enables Comparison of Photometric Properties by Osram GmbH The concept of the light-emitting surface (LES) has been developed by the Zhaga Consortium to enable comparisons of the photometric properties of different LED light engines. Stefan Lorenz, a Systems Architect with Osram GmbH, describes the theory behind the LES and how it applies to the different Zhaga Books. Read more »

LpR Article | Research | Jul 11, 2016

Al2O3 Coated Europium- Activated Aluminum Silicon Nitride for COB LED Technology by the Graz University of Technology and Tridonic Jennersdorf

Al2O3 Coated Europium- Activated Aluminum Silicon Nitride for COB LED Technology by the Graz University of Technology and Tridonic Jennersdorf Eu2+ activated nitride phosphors have drawn much interest for solid state lighting because of their interesting photoluminescence. While they show excellent optical properties, they are hygroscopic and have the potential of being degraded by atmospheric moisture and high temperatures. A coating layer on the surface is an effective method to improve stability against moisture and oxidation. For use in chip on board technology, Nika Mahne, master student at the Institute of Inorganic Chemistry, A. Reichmann, B. Bitschnau, R. Fischer, from the Graz University of Technology, and F. Schrank from Tridonic Jennersdorf propose an approach where a CaAlSiN3:Eu2+ [1, 2, 3] phosphor was coated with Al2O3, obtained via a Brønsted precipitation reaction based on a solution-coating process from a mixture of aluminum halide with a base after annealing at a temperature of 400°C. Read more »

LpR Article | Technologies | Jul 07, 2016

New Class of Siloxane Polymers for Advanced LED Packaging

New Class of Siloxane Polymers for Advanced LED Packaging Packaging presents a major challenge to further improve LED device efficiency and reliability. A novel class of high stability siloxanes forms a technology platform to address such opportunities in die attach, encapsulation, and light outcoupling applications. Dr. Juha Rantala, CEO & Founder, Dr. Joerg Rockenberger, Director Application & Business Development, Dr. Jyri Paulasaari, Vice President Technology, Dr. Jarkko Heikkinen, Director Inks & Pastes. Markus Laukkanen, Application Manager, and Dr. Janne Kylmä, Vice President Engineering & Production at Inkron Oy explain the material properties and give examples of how these new materials in combination with novel nanomaterials enable products fully compatible with current process tools and flows while having superior properties. Read more »

LpR Article | Technologies | Jul 06, 2016

LED Light Spectrum Enhancement with Transparent Pigmented Glazes

LED Light Spectrum Enhancement with Transparent Pigmented Glazes While LED bulbs have the distinct economic advantages of using less energy, producing less heat and lasting years longer than traditional incandescent bulbs, when objects are viewed under LED light, they frequently appear to be of different colors than when viewed in sunlight or with incandescent lights. Jan-Marie A Spanard from Light Spectrum Glazes proposes and explains an approach to optimize the spectral distribution of LED light to overcome this weakness. Read more »

LpR Article | Jul 05, 2016

Focus Tunable Lenses for LED Lighting by Optotune AG

Focus Tunable Lenses for LED Lighting by Optotune AG Focus tunable lenses open up new possibilities in the design of LED based luminaires. With these shape changing lenses, the beam angle of a spotlight can be flexibly adjusted while keeping the efficiency on a constant, high level. Compact solutions combining a floodlight and a spotlight in one product can therefore be realized. This innovative technology reduces complexity and offers more flexibility in lighting design, especially for changing environments like museums, and shops. Joerg Wertli from Optotune AG demonstrates a very interesting technology for these applications. Read more »

LpR Article | Jul 05, 2016

Development Process for a Metal-Halide Replacement LED Module by Neonlite International Ltd.

Development Process for a Metal-Halide Replacement LED Module by Neonlite International Ltd. Seen for the first time at this year’s Light + Building, the TECOH® MHx, has provided specifiers and designers with a viable LED metal halide alternative. Talking about the issues surrounding such a development, Fred Bass, Managing Director of Neonlite International Ltd., the brand owner of MEGAMAN, shows how the module series has been developed and highlights its potential for metal halide replacement moving forward. Read more »

LpR Article | Jul 05, 2016

Aspects of Light Quality in Solid State Lighting by OSRAM Opto Semiconductors

Aspects of Light Quality in Solid State Lighting by OSRAM Opto Semiconductors For ages the quality of light has been one of the biggest topics for luminaire manufacturers. But since the introduction of LEDs in general lighting the definition of light quality has got a new dimension. Pros and cons of LED lighting quality are often very controversial. Alexander Wilm, Application Engineering Manager of OSRAM Opto Semiconductors, presents facts about LED lighting quality that provide a sound basis for discussions. Read more »

LpR Article | Jul 05, 2016

LED Market and Development Trends from the Point of View of a Full-Range Trader in Lighting by Everlight

LED Market and Development Trends from the Point of View of a Full-Range Trader in Lighting by Everlight In an interview with LED professional, Ms. Beate Jungwirth, Director of Marketing & Communications and PR at Everlight and Dr. Christopher Keusch, Senior Sales Manager at Everlight, talk about the market and development trends in the area of LEDs. The experts also discuss Everlight’s focus at the LED professional Symposium +Expo 2012 which takes place in Bregenz, Austria from September 25th to 27th. Read more »

LpR Article | Jul 05, 2016

An LED Solution for Historic Monumental Electric Chandeliers by Ramselaar Light Solutions

An LED Solution for Historic Monumental Electric Chandeliers by Ramselaar Light Solutions The Netherlands Institute for War Documentation (NIOD) is housed in a magnificent monumental late 19th century building at the Amsterdam Herengracht (the Netherlands). Recently, the unique brass chandeliers were provided with LED lamps, which were specially developed for this project by Ramselaar Light Solutions. Ron Ramselaar and M. Brouwers, advisor on behalf of the Government Buildings Agency (RGD), tell us about this extraordinary project. Read more »

LpR Article | Jul 05, 2016

Human-Centric Lighting: Sensor Technology for Full- Spectrum Lighting Solutions by ams

Human-Centric Lighting: Sensor Technology for Full- Spectrum Lighting Solutions by ams While not necessarily common knowledge, research is rapidly validating the common-sense understanding that human beings are “tuned” to the natural lighting cycles of the sun, and can be equally “de-tuned”, to the detriment of both health and productivity, by artificial light sources that operate contrary to these natural flows. Sajol Ghoshal, Director of Sensor Driven Lighting at the Opto Sensor and Lighting BU at ams, discusses the available approaches for full-spectrum solutions, and potential humancentric benefits, of fully integrated intelligent ambient/color light sensor and driver technology. Read more »

LpR Article | Jul 05, 2016

Additive Manufacture of Optics Goes Digital by LUXeXceL B.V.

Additive Manufacture of Optics Goes Digital by LUXeXceL B.V. With a new technology for additive manufacturing, optics fabrication has gone digital, making more product innovation and variety affordable by eliminating the expense of molds and tooling, enabling just-in-time manufacturing and bringing a new freedom for optics and lighting designers. Marco de Visser, Business Development Manager at LUXeXceL B.V. gives an update on this technology and its new opportunities. Read more »

LpR Article | Jul 05, 2016

LED Market and Development Trends from the Point of View of a Full-Range Trader in Lighting by Everlight

LED Market and Development Trends from the Point of View of a Full-Range Trader in Lighting by Everlight In an interview with LED professional, Ms. Beate Jungwirth, Director of Marketing & Communications and PR at Everlight and Dr. Christopher Keusch, Senior Sales Manager at Everlight, talk about the market and development trends in the area of LEDs. The experts also discuss Everlight’s focus at the LED professional Symposium +Expo 2012 which takes place in Bregenz, Austria from September 25th to 27th. Read more »

LpR Article | Jul 05, 2016

DC-Grids - Challenges and Chances for LED Lighting by the Fraunhofer Institute and LED professional

DC-Grids - Challenges and Chances for LED Lighting by the Fraunhofer Institute and LED professional At the beginning of November many important aspects of DC Grids were discussed at the Fraunhofer Institute for Integrated Systems and Device Technology in Erlangen at the European Center for Power Electronics (ECPE) conference. Besides fundamental issues, very specific ones like how the introduction of DC Grids affects lighting technologies and especially LED lighting were part of the program. Below, Arno Grabher-Meyer from LED professional gives a summary of the speeches and expert discussions and gives us an idea of what the key ideas could mean to the LED lighting community. Read more »

LpR Article | Jul 05, 2016

Energy Efficiency and Thermal Simulations of a Retrofit LED Light Bulb by the University of Turku

Energy Efficiency and Thermal Simulations of a Retrofit LED Light Bulb by the University of Turku Mika Maaspuro and Aulis Tuominen from the University of Turku investigated the energy efficiency of a LED driver mounted inside a retrofit light. The heat generation of the LEDs and the driver of the light bulb have been simulated and measured. A thermal model for the light bulb has been created and simulated using a Finite-Element-Method (FEM) software. Parameters of the model have been adjusted to match the temperature measurements which have been done with IR-camera and thermocouples. Read more »

LpR Article | Jul 05, 2016

Energy Efficiency and Thermal Simulations of a Retrofit LED Light Bulb by the University of Turku

Energy Efficiency and Thermal Simulations of a Retrofit LED Light Bulb by the University of Turku Mika Maaspuro and Aulis Tuominen from the University of Turku investigated the energy efficiency of a LED driver mounted inside a retrofit light. The heat generation of the LEDs and the driver of the light bulb have been simulated and measured. A thermal model for the light bulb has been created and simulated using a Finite-Element-Method (FEM) software. Parameters of the model have been adjusted to match the temperature measurements which have been done with IR-camera and thermocouples. Read more »

LpR Article | Jul 05, 2016

Sensors and Feedback Control of Multi-Color LED Systems by MAZeT GmbH

Sensors and Feedback Control of Multi-Color LED Systems by MAZeT GmbH To obtain stable and consistent lighting conditions within the black body range with LED systems, especially RGBx systems is a challenging task. Feedback controlled systems are expensive, but the best solution. Here, the question of which type of sensor accomodates the given application best, arises. Thomas Nimz, Fredrik Hailer and Kevin Jensen from MAZeT GmbH discuss different options based on their scientific studies on LED systems with four or more different LEDs considering secondary conditions like color rendering index. Read more »

LpR Article | Jul 05, 2016

Mesopic Photometry - An Accurate System of Road Lighting Evaluation by Surya Roshni Ltd.

Mesopic Photometry - An Accurate System of Road Lighting Evaluation by Surya Roshni Ltd. For a long time, photopic vision was the basis for all light measurement tasks, but today this approach is challenged. According to several research results, it seems that mesopic vision should be used as a basis to evaluate street lighting applications or other low level lighting applications. Prija Jain from the Executive Design and Development (Photometry & Optics) department of Surya Roshni Ltd. in India gives us an overview on the recent status of the discussion, explains it and shows the resulting consequences. Read more »

LpR Article | Jul 05, 2016

Practical Results of a Gas Station Refurbishment with LED Luminaires by the Electromagnetica SA Semiconductor Lighting Centre

Practical Results of a Gas Station Refurbishment with LED Luminaires by the Electromagnetica SA Semiconductor Lighting Centre Perfect lighting at a gas station is very important for competitiveness. But a conventional lighting system is also a costly and energy demanding installation with high maintenance costs. Stelian Matei from the Electromagnetica SA Semiconductor Lighting Centre shows how a well-planned upgrade of conventional lighting to LED lighting lowers energy consumption and maintenance and, therefore, costs. Read more »

LpR Article | Jul 05, 2016

Practical Results of a Gas Station Refurbishment with LED Luminaires by the Electromagnetica SA Semiconductor Lighting Centre

Practical Results of a Gas Station Refurbishment with LED Luminaires by the Electromagnetica SA Semiconductor Lighting Centre Perfect lighting at a gas station is very important for competitiveness. But a conventional lighting system is also a costly and energy demanding installation with high maintenance costs. Stelian Matei from the Electromagnetica SA Semiconductor Lighting Centre shows how a well-planned upgrade of conventional lighting to LED lighting lowers energy consumption and maintenance and, therefore, costs. Read more »

LpR Article | Research | Jul 04, 2016

Flexible OLEDs for Lighting Applications by the Holst Centre

Flexible OLEDs for Lighting Applications by the Holst Centre While OLEDs already have successfully found their way into display applications, the breakthrough in lighting applications is still pending. The reasons are diverse, but cost is one major point. Another reason is the current edge of inorganic LEDs giving reasonable design opportunities in many standard applications. However, there are applications where OLEDs could score, especially the flexible OLEDs. But even these OLEDs need to become cheaper to be applied widely. The Holst Centre and partners aim to develop generic technologies for large area flexible OLEDs which can be processed with roll-to-roll (R2R) technology. Process Engineer Tansim Baig gives an example and an overview of the current status of the development. Read more »

LpR Article | Jul 04, 2016

Lighting & Building Automation Technologies

Lighting & Building Automation Technologies The transition from traditional lighting technology to LED is old news. People in the lighting business no longer talk about the “LED Revolution”. Today’s revolution, perhaps spurred on by LED technology, is in building automation and lighting controls. Lighting experts know that while LED products have the potential to achieve terawatts of power savings worldwide over the next decade, even larger power savings might be achieved through effective lighting control and building automation systems. Greg Galluccio, Director at Leviton Manufacturing discusses lighting load-shedding strategies, such as daylight harvesting, occupancy sensing, task management and demand response as well as the trends towards the interaction of lighting control with other building functions. Read more »

LpR Article | Jul 04, 2016

Advanced Passive Thermal Management Solutions for High Power LEDs by Advanced Cooling Technologies (ACT)

Advanced Passive Thermal Management Solutions for High Power LEDs by Advanced Cooling Technologies (ACT) There are two main solutions to improve passive thermal management in LED devices. One is to increase the surface area of a heat sink. This requires additional size, weight and material and offers only marginal improvement. The second solution is to increase the thermal conductivity between the heat source and the sink. The latter is supported by well-established technologies like heat pipes and vapor chambers. Richard Bonner, Manager for Custom Products, and Peter Ritt, Vice President at Advanced Cooling Technologies (ACT) give insight into the latest developments and explain how they work, how they are designed and applied correctly, and discuss their opportunities, advantages and limitations. Read more »

LpR Article | Jul 02, 2016

Using Integrating Spheres Correctly to Measure LEDs

Using Integrating Spheres Correctly to Measure LEDs LEDs have opened up new dimensions of design freedom, allowing architects and designers to give free rein to their creativity. Light-emitting diodes permit manifold design solutions as a light source in illumination products. However, a suitable measuring method for comparing key technical data is required in order to get the best out of the diversity of illumination products available. Mikolaj Przybyla from GL OPTIC, a Just Normlicht GmbH division, explains crucial product requirements and what to take care about when calibrating a measurement system. Read more »

LpR Article | Jul 02, 2016

Reliable Thermal Management of High-Power LEDs by Haeusermann

Reliable Thermal Management of High-Power LEDs by Haeusermann Stefan Hörth believes that FR4 PCBs can easily replace IMS PCBs and even open new fields of LED applications. Haeusermann’s HSMtec Product Manager demonstrates that common FR4 laminates, including special copper filling, will sufficiently withstand the heat of HB LEDs. Read more »

LpR Article | Jul 02, 2016

EMI Problems in TRIAC Dimmable LED Drivers by RECOM Lighting

EMI Problems in TRIAC Dimmable LED Drivers by RECOM Lighting TRIAC dimming adds a dimension to Power Factor (PF) and Total Harmonic Distortion (THD) that is rarely defined by LED driver manufacturers. Bianca Aichinger, Product Marketing Manager at RECOM Lighting, examines the relationship between PF, THD and harmonics and explains why this relationship can change as soon as the LEDs are dimmed, thus causing increased EMI and undesirable visible effects such as LED flashing and flicker. The European standards for EMC and Harmonics are only specified for full load and in the non-dimmed condition. In practice, there are often dimmer/driver/LED load conditions which may meet the regulations when undimmed, but fail significantly if dimming is used. Read more »

LpR Article | Jul 02, 2016

An Economical Omnidirectional A19 LED Light Bulb by the Industrial Technology Research Institute

An Economical Omnidirectional A19 LED Light Bulb by the Industrial Technology Research Institute Since 2009, when the Japanese government was vigorously promoting LED bulbs in end-market applications, they have become mainstream commodities in the LED lighting market. Chen-Peng Hsu, project manager of Electronics and Optoelectronics Research Laboratories at Industrial Technology Research Institute (ITRI), introduces the R&D 100 award-winning invention of an omnidirectional A19 LED light bulb that is light weight and economical. Read more »

LpR Article | Jul 01, 2016

The Influence of LED Emission Characteristics on the Efficiency of Lighting Systems by Osram Opto Semiconductor

The Influence of LED Emission Characteristics on the Efficiency of Lighting Systems by Osram Opto Semiconductor In general lighting, efficiency is the main focus. Under specific operation conditions, the main issue appears to be luminous flux. Dr. Roland Schulz, application engineer in the Solid State Lighting division at Osram Opto Semiconductor, takes a deeper look at the influence of LED radiation characteristics. Read more »

LpR Article | Jul 01, 2016

The Influence of LED Emission Characteristics on the Efficiency of Lighting Systems by Osram Opto Semiconductor

The Influence of LED Emission Characteristics on the Efficiency of Lighting Systems by Osram Opto Semiconductor In general lighting, efficiency is the main focus. Under specific operation conditions, the main issue appears to be luminous flux. Dr. Roland Schulz, application engineer in the Solid State Lighting division at Osram Opto Semiconductor, takes a deeper look at the influence of LED radiation characteristics. Read more »

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