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Standardization + Regulation | Jun 04, 2012

Zhaga - Insights into the New LED Lighting “Standard” for Light Engines

Mr. Greg Galluccio Greg Galluccio, Director of LED Business Development and Product Management for Lighting and Energy Solutions at Leviton and Zhaga spokesperson, talked to Siegfried Luger and Arno Grabher- Meyer from LED professional at the Light+Building in Frankfurt about the Zhaga LED lighting “Standard”. The industry initiative, Zhaga, will fundamentally influence the lighting business because of the interchangeability of LED light engines. Read more »

Commentary | May 15, 2012

Solid State Luminaires Pave the Way for an Industry

Christian Hochfilzer From metal sheet forming to optoelectronic systems: Luminaire manufacturing began soon after the production release of incandescent bulbs and since then has been linked to the peculiarities of the used light source. Read more »

Commentary | May 10, 2012

LED Lighting Trends in 2012: The Rise of Lighting Solutions?

Pars Mukish works at Yole Développement as a Market and Technology Analyst in the fields of LED and Compound Semiconductors where he makes technical, economic and marketing analyses. He holds a Master’s degree in Engineering (ITECH – France) and a Master’s degree in Innovation and Technology Management (EM Lyon – France). He has worked as a Marketing Analyst and Techno-Economic Analyst for the past several years at the CEA (French Research Center). LEDs have already reached a sufficient “price/performance” level to enable massive adoption in LCD display applications. General Lighting applications will be the next and largest market for LED light sources. But the fact is that General Lighting can only take off if the cost/performance of LED based products can beat incumbent technologies. In that context, many of the lighting domain actors are developing new services in order to add innovation and value to Solid State Lighting, and differentiate them from traditional technologies. Will 2012 be the rise of Lighting Solutions? Read more »

Interview | Apr 26, 2012

LED Technology – Changing the Component Business in the Area of Lighting

Volker Neu, General Manager of LED at Vossloh-Schwabe Optoelectronic In an interview with LED professional, Volker Neu, the General Manager of LED at Vossloh-Schwabe Optoelectronic explains the influence LED technology has on the component business in the area of lighting. Internal and external changes and alterations are necessary to be able to adjust to new technologies. Innovations and standards are especially important for moving the business of LED solutions forward. Read more »

Technology | Aug 01, 2010

LED Failure Modes and Methods for Analysis

Figure 2: Reflected light (left) and transmitted light (right) microscopy of a typical surface corrosion. LED’s open the way to new applications and markets in various different fields with a broad spectrum of requirements. Beneath other beneficial characteristics, in general, LED’s provide a high reliability, and a lifetime of more than 50;000 hours can be reached. Poor workmanship in manufacturing and unfavorable operational conditions may reduce the reliability significantly. To avoid failures or to achieve fast resolutions of existing problems a good knowledge of the failure mechanisms and suitable analytical methods is required. Objective of this article is to provide an overview of state of the art techniques in LED-Failure analysis. Read more »

Technology | Dec 01, 2008

LED Source Modeling Method Evaluations

Figure 2: Type 3 Source Model Geometry Producing accurate simulations of LED based optical systems requires accurate source models. This means the source models must not only produce the correct distribution of light in a far field measurement, they must also produce the correct near field behavior since secondary LED optics are often employed in very close proximity to the LED. Accurate simulations are vital to the design process especially with lens optics commonly used on LEDs given the high cost and long lead times for lens tooling. The data presented in this paper is a direct result of the lessons learned by one manufacturer about the importance of simulation accuracy. Read more »

Technology

High Quality GaN Substrates for Modern LED Technology

Figure 3: AFM data illustrating the NI density for a) sample A and b) sample B. The overgrowth of sparse NIs can result in formation of new islands (c). Using increased reactor pressure the formation of new islands during HT overgrowth can be suppressed (d). All the scans are 10 μm × 10 μm. It is well known that modern III-nitride based technologies for light emitting diode (LED) production include (as an initial inevitable step) the preparation of GaN templates. Such GaN templates are usually delivered on foreign substrates possessing high lattice mismatch with respect to GaN layers, e.g., sapphire or silicon carbide substrates. The growth of GaN layers on highly mismatched substrates occurs via the formation of 3D islands with their following coalescence [1]. Such growth mode results in an extremely high density of threading dislocations (TDs) up to 1010–1011 cm–2 in the layer interior [1]. These TDs are known as main sources for the deleterious performance of LEDs and other GaN based electronic and optoelectronic devices [2]. Therefore there exists an ultimate necessity in the developing of effective and low-cost recipes for low TD density GaN template manufacturing. Read more »

Technology

Measurement of LEDs

Figure 5: NIST gonio-spectroradiometer for the total spectral radiant flux scale realization Various new types of light emitting diodes (LEDs) are being developed and introduced for general illumination and other applications, and there are increasing needs for accurate measurements of various optical parameters of LEDs. Traditional standard lamps do not meet the calibration needs for LED measurements as LEDs differ substantially from traditional lamps in terms of physical sizes, flux levels, spectra, and spatial intensity distributions. Read more »

Technology

Primary and Secondary Optic Materials - LED Luminaire Performance and Lifetime

Figure 1: LumiBright LE line of light engines for commercial applications and incorporating high efficiency primary optics, photosensor, and thermistor on a high thermal conductivity metal core PCB in one package. Numerous articles have been published regarding the lifetime of Light Emitting Diode (LED) luminaires, however, the primary focus has typically been on the lifetime of the LED die itself. Given that the LED luminaire is a system, it is important to recognize all aspects of the system that can affect or limit lifetime. Read more »

FEATURED

UniDriver® Universal Input Line Voltage LED Drivers

UniDriver® Universal Input Line Voltage LED Drivers LTF Technology’s UniDriver Series offers the ultimate in flexibility and ease of driver selection for lighting industry OEMs and specifiers. These technologically-advanced LED drivers offer True-Tri-Mode dimming from 100V to 277V (ELV, TRIAC, 0-10V), dimming levels from 100% to 0.1%, compatibility ... Read more »

FEATURED

NICHIA LED Technology Presented at LICHTWOCHE München

NICHIA LED Technology Presented at LICHTWOCHE München LED manufacturer NICHIA, a specialist in highly efficient lighting, Human Centric Lighting and the imitation of natural light, will participate in the Munich Lichtwoche 2021 from 5 to 12 November with a light installation, two presentations and a discussion on the topic of UV-C. The light ... Read more »

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