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Editorial Preview: LpR 66 | March/April 2018
Planned Topic* Description Keywords - Content

LpS Best Papers
Scientific award nominated

Lifetime- and Economic Efficiency Simulation of LED Luminaires

The lifetime of an LED system is usually specified by the LM-80 report using the TM-21 method. Unfortunately, this value is solely valid for one specific application. Despite these uncertainties, a new open-source Modelica library for dynamic simulation of LEDs parametrized with manufacturer information, e.g. the datasheet, but still provide sufficient accuracy to evaluate the lifetime and the corresponding economic efficiency of LEDs and to dimension all relevant components.

LED lifetime, LM-80 / TM-21, operating cycle, dynamic ambient temperature, component dimensioning

Tech-Talks Bregenz (TTB)
Innovator & LED lighting pioneer

Fred Maxik - Founder and CEO, Lighting Science Group

LpS 2017 Keynote speaker Fred Maxik is one of the most innovative pioneers in LED lighting and thought about “Human Centric Lighting” long before this trend became popular. LED professional talked about his ideas, the technology and future prospects.

Human centric lighting, dynamic lighting, physiology, biodynamic

LED robustness and vulnerability

Preventing Electrical Over Stress – How to Prevent an LED Failing Earlier than Expected

LEDs are basically pretty robust light sources, but there are still conditions that lead immediately to a fatal failure. One is electrical over stress. All aspects when a LED fails due to a voltage beyond its specification limits and reasons why the failure occurs will be explained as well as how to prevent this. The fundamental aspects of a good PCB layout design and how this is linked to longevity of an LED will be explained.

LED specifications, voltage limits, excess voltage, PCB, layout

Intelligent LED drivers

Method and Circuit to Maintain Constant Light Output for LED Luminaires

For LED luminaires, it is difficult to accurately predict the lifetime or the light output degradation. A Constant Light Output (CLO) operation is implemented in some of the latest drivers. However, there are many factors which require a different algorithm in terms of time rate and forward current values which are usually not taken into account. A new method is maintaining the luminous flux over the lifetime of the LED luminaire, considering the luminaire global light degradation.

LED system degradation over time, lifetime, driver, compensation

Light source for biodynamic light

A Hybrid Light Source for Near Infrared Enhanced LED Lighting

With the evolution of LED lighting, Human Centric Lighting (HCL) became an important trend. While HCL is not clearly defined, a common understanding is that this is light and lighting that supports health and well-being of humans. Some newer proposals are going beyond this approach by providing invisible radiation for which research and the evolution of humans show evidence for positive health and well-being effects. A new approach that adds NIR radiation to LED illumination is discussed.

Human centric lighting, health, well-being, spectrum, near infrared, hybrid solution

Product ads gain maximum impact when placed with the corresponding editorial theme! The editorial topics mentioned above are special features among a wide range of topics impacting the LED industry. Every issue also covers the latest industry news, technological breakthroughs, state-of-the-art products, and much more...

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GRE Alpha Introduces ENO-DIM EnOcean Wireless Dimming Module

GRE Alpha Introduces ENO-DIM EnOcean Wireless Dimming Module GRE Alpha announced the release of its cutting-edge ENO-DIM dimming module with integrated EnOcean technology. The spring-loaded terminal simplifies installation and is compatible with any EnOcean-enabled wireless switch. With the ready to install dimming module, it's just plug and play. The ... Read more »


LiFi - What It Is, How It Works, What It Provides, How to Apply, and Its Future Prospects

LiFi - What It Is, How It Works, What It Provides, How to Apply, and Its Future Prospects The acronym LiFi (Light Fidelity) was born at the beginning of the 2010s. Its name derives from the very well-known WiFi (Wireless Fidelity). The term VLC (Visible Light Communication) is used in the restricted instances of visible light. Mr. Luc Chassage who works for Oledcomm and the Versailles ... Read more »


High Conductive Foils Enabling Large Area Lighting

High Conductive Foils Enabling Large Area Lighting Fraunhofer Institute for Organic Electronics, Electron Beam and Plasma Technology FEP as one of the leading partners for research and development for surface technologies and organic electronics and Sefar AG, a leading manufacturer of precision fabrics from monofilaments, developed a roll-to-roll ... Read more »