Technology News

Technologies | LpR Article

A New Approach to the Design of Driverless AC LED Light Engines

Example of a sub 5 W driverless LED light engine Driverless AC LED light engines have now become a commonplace item of commerce in the lighting industry. Nearly all of them use high voltage integrated circuit switching chips to intelligently change the number of LEDs in a string during a power line cycle so that the voltage of the LED string matches the instantaneous power line voltage. However, customers are demanding higher efficiency, lower cost, and especially a reduction in the flicker content of the emitted light. Peter W. Shackle, president of the consulting company, Photalume, describes some new circuits for AC LED light engines [1] that provide a non-dimming solution with reduced cost, increased efficiency and better light quality as perceived by the human eye. Read more »

Technologies | Electronics | Oct 06, 2015

µModule LED Driver Integrates All Circuitry, Including the Inductor in a Surface Mount Package

Only 9 x 15 x 4.32 mm, the LTM8040 LED driver is a complete system in an LGA package David Ng, Module Development Manager at Linear Technolgies, explaines the features of a compact step down DC/DC module for distributed LED power supplies in a DC grid that offers high efficiency, a wide dimming range, and a current range from 35 mA to 1 A. Read more »

Technologies | LEDs | Light Conversion | Sep 01, 2015

FAU Researchers Create the World's First White LEDs Based on Fluorescent Proteins

Gel-like networks consist of a concentrated aqueous protein solution and a polymer compound (Image: Michael Weber) LEDs are up to 80 percent more energy-efficient than normal light bulbs and last around five times as long as energy-saving light bulbs. As a result they are being used more and more frequently as a source of light. Nevertheless, white LEDs still have room for improvement, as current manufacturing processes are either very expensive or result in the lifetime of the LEDs being reduced. Researchers at FAU have now developed a new, rather unusual manufacturing method: their LEDs are partly made of fluorescent proteins. Read more »

Resources | Reports | Technologies | Controls | Jul 22, 2015

NLPIP Releases Report on Wired and Wireless Lighting Controls

The graphics from the report shows how different sensor systems can behave; in this case a wired vs. a wireless photosensor The National Lighting Product Information Program (NLPIP) at Rensselaer Polytechnic Institute’s Lighting Research Center (LRC) recently released its latest publication, Lighting Answers: Comparison of Wired and Wireless Lighting Controls for Single Rooms. Read more »

Technologies | Thermal Management | Jun 24, 2015

Litecool Turns LED Packaging on Its Side

Litecool's new packaging concept significantly reduces the thermal resistance of LED packages by using a vertical dielectric Litecool has produced LED packages in a vertical orientation rather than horizontal. This means that the dielectric layers only have a minor impact on the thermal performance of the LED package and allow the heat to escape more effectively through the metallic parts of the package. This has significant benefits for flip-chip packaging where dielectric layers are usually very close to the diode. Read more »

Resources | Roadmap | DoE | Technologies | SSL | Jun 15, 2015

DoE: Solid-State Lighting R&D Plan

The solid-state lighting (SSL) revolution signals a profound shift in how we will use and consider lighting and represents a huge opportunity to generate significant energy savings. The energy being used for lighting represents a significant portion of global energy use. Rising electricity prices, mounting concerns about climate change, and desire for energy independence are causing the global lighting market to shift toward more energy-efficient light sources. Read more »

Technologies | Electronics | May 27, 2015

Power Conversion Efficiency - Key for Stand-Alone Solar Powered Lighting in Nordic Regions

A sophisticated driver design and controls system is the most relevant component for a truly efficient power conversion enabling the use of stand-alone solar powered lights in the Nordic regions even in winter time Stand-alone solar powered lighting solutions are made possible even in the Nordic region through a new, ground-breaking Danish project. An ideal collaboration between scientists from 4 different fields and private companies has succeeded in creating a system and a methodology that makes the impossible possible: Outdoor solar lighting which is not just a decoration. Read more »

Technologies | Optics | Material Science | May 12, 2015

ORNL Superhydrophobic Glass Coating Offers Clear Benefits - Maybe Also for Lighting Optics

Schematic representation of the coated product and applications. The properties could also be useful in different lighting applications lke outdoor lighting, street lighting or for automotive headlights A moth’s eye and lotus leaf were the inspirations for an antireflective water-repelling, or superhydrophobic, glass coating that holds significant potential for solar panels, lenses, detectors, windows, weapons systems and many other products. The discovery by researchers at the Department of Energy’s Oak Ridge National Laboratory, detailed in a paper published in the Journal of Materials Chemistry C, is based on a mechanically robust nanostructured layer of porous glass film. The coating can be customized to be superhydrophobic, fog-resistant and antireflective. Read more »

Resources | Reports | Market | Technologies | OLEDs | Dec 11, 2014

Research and Markets Announces OLED Lighting Opportunities 2015-2025 Forecast

The report covers several different aspects like for instance a comparison between important LED and OLED properties OLED lighting is an emerging solid-state lighting technology. It potentially provides a route into the large and growing global lighting market. The lighting market is however complex as it is a highly fragmented space thanks to the existence of a broad technology mix and a diversity of customer needs. Read more »

Technologies | Optics | Material Science | Jul 04, 2014

Novel Nanoparticle Production Method Could Lead to Better LED Lights, Lenses and Solar Cells

Sandia National Laboratories researchers Dale Huber, left, and Todd Monson have come up with an inexpensive way to synthesize titanium-dioxide nanoparticles, which could be used in everything from solar cells to light-emitting diodes. (Photo by Randy Montoya) Sandia National Laboratories has come up with an inexpensive way to synthesize titanium-dioxide nanoparticles and is seeking partners who can demonstrate the process at industrial scale for everything from solar cells to LEDs. Titanium-dioxide (TiO2) nanoparticles show great promise as fillers to tune the refractive index of anti-reflective coatings on signs and optical encapsulants for LEDs, solar cells and other optical devices. Read more »

Technologies | Measurement | Jun 18, 2014

How Much Can the Color of Nominal CCT Vary?

Color Temperatures The threshold at which a color difference becomes perceptible is defined by a MacAdam ellipse. A MacAdam ellipse is drawn over the color space in such a way that the color at its center point deviates by a certain amount from colors at any point along its edge. The scale of a MacAdam ellipse is determined by the standard deviation of color matching (SDCM). A color difference of 1 SDCM “step” is not visible; 2 to 4 steps is barely visible; and 5 or more steps is readily noticeable. Read more »

Technologies | Engineering | Systems | Mar 21, 2014

Not Just Light Generation - Xicato Calls It "Internet of Lights" or Lighting 2.0

Key properties and features of Lighting 2.0 and the Internet of Lights Xicato, in cooperation with Echelon will demonstrate a new integrated controls approach. What Xicato understnds when saying "Internet of Lights" is already explained shortly on their website. If you are interested in topic like this, don't miss LpR 43. Read more »

Technologies | Electronics | LiFi | Jan 14, 2014

Enhanced Data Transmission for Li-Fi Communications using LED Lighting

Experimental set-up of a Li-Fi receiver Despite continuous improvements in wireless communication technology, e.g. 3G, LTE, 4G etc., a looming crisis is anticipated due to a lack of sufficient radio frequency bandwidth to support the growth in demand for data transmission, in the so called “Spectrum Crunch”. Visible Light Communication (Li-Fi) offers an economical solution. LED lighting is now widely deployed and can, in parallel with its primary function, also be used for wireless communication. Li-Fi demonstrates significant improvements in security, safety and capacity over radio frequency communication, and ease of deployment as compared with fibre-optic cable. The LED link is untethered, enables links with many mobile devices, and is independent of any one host. Improvements to the data rate achievable using LEDs as the transmitter allows services based on Li-Fi concept to outperform other communication modes. Read more »

Technologies | Thermal Management | Jul 30, 2013

NRL Researchers Discover Novel Material for Cooling of Electronic Devices

Schematic of thermal management in electronics: Local temperature increases occur as a result of current flow in active regions of devices and can lead to degradation of device performance. Materials with high thermal conductivities are used in heat spreading and sinking to conduct heat from the hot regions. (Photo: U.S. Naval Research Laboratory)  A team of theoretical physicists at the U.S. Naval Research Laboratory (NRL) and Boston College has identified cubic boron arsenide as a material with an extraordinarily high thermal conductivity and the potential to transfer heat more effectively from electronic devices than diamond, the best-known thermal conductor to date. Read more »

Technologies | Measurement | Feb 20, 2007

MaxMile Technologies introduces EpiEL mapping system optimized for nitride-based LED applications

epiel2-gif MaxMile Technologies, LLC at Lexington has recently introduced a EpiEL mapping system (EpiEL-700) which is optimized for nitride-based LED applications. Read more »

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