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2014-09-11
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Editorial: What We Can and What We Still Cannot Do with LEDs
 
... In recent years, the LED makers have raised the bar on performance of their LED chips and modules. One of the biggest changes has been in lumens per dollar. In both the high-power and mid-power LED chips and modules. Cree, Osram, and Philips have been at the forefront of...
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For the latest news dedicated to LEDs in general lighting, tune to Solid State Lighting Design. Applications updates, the latest luminaires and wins, subsystems and componentry in support of lighting in and around the built environment, it's all there!


Commentary...
What We Can and What We Still Cannot Do with LEDs

 
... In recent years, the LED makers have raised the bar on performance of their LED chips and modules. One of the biggest changes has been in lumens per dollar. In both the high-power and mid-power LED chips and modules. Cree, Osram, and Philips have been at the forefront of...

View the full story at the bottom of the current news page, or if this is a back issue, go here...

Leti and Luciom Focus on High-data-rate LiFi Applications
LIGHTimes News Staff

September 11, 2014...Luciom, which develops visible-light communication using LEDs, and CEA-Leti of Grenoble, France have launched a project to develop high-data-rate LiFi transceivers. In mid-2015, Luciom plans to begin offering the first high-data-rate bidirectional light-fidelity (LiFi) products that can work with different LED lighting sources, and can work on various mobile devices.

Luciom notes that Visible Light Communications (VLC) has gained significant momentum in recent years, primarily because LEDs are expected to become predominant. Luciom goes so far as to suggest that eventually LiFi will be more efficient and economical compared to wireless RF communications do to rapid market penetration and reduced production costs.

LEDs can be modulated at very high frequencies. High-speed oscillations are invisible to humans allow very high data rates of information transmission. Earlier in 2014, Leti demonstrated a new prototype for wireless high-data-rate Li-Fi transmission that uses LED engines in commercial lighting. Leti says that the technology achieves throughputs of up to 10Mb/s at a range of three meters. At this data rate, the company says it would be suitable for HD video streaming or Internet browsing, using direct or even indirect LED lighting with a luminous flux of under 1,000 lumens. Luciom says that the technology will be adapted to meet the needs its transceivers.

Luciom claims that its technology allows any LED lighting source to act as a high-speed data transmitter that is both secure and environmentally -friendly. The technology, which uses integrated circuits and transceivers, turns LED light sources into positioning beacons, which transmit signals that indicate the location of the specific luminaire. The technology so far only allows one way communication from the light source to the

Smartphones and tablets can become LiFi receivers using their camera as a receiver. When combined with WiFi or Bluetooth in a 3.5mm audio jack Bluetooth dongle, a LiFi application launched from a smartphone can transmit to a server. The companies hope to go a step further than what can be done now to offer a receiver and transmitter (transceiver) that can be connected to a smartphone via an audio dongle.

Luciom says its technology can be combined with the use of gyro-sensors in smartphones and tablets to predict movement between two LiFi beacons and calculate a very accurate position of the user.

Indoors, when GPS technology does not work, communication between phones and smart indoor LED lighting can be used, Locium says that the localization application can provide additional personalized services or information to customers as well as information to the infrastructure manager.

The company is targeting high-data-rate video transfer via LiFi in future products and apps. The project between Leti and Luciom builds on their previous collaboration in which Leti developed an optical over-the-air data link for the company that allows the transmission of true HD video from a lamp to a handheld receiver.

"Our indoor geo-localization could guide shoppers through the maze of large shopping malls to the stores they are seeking, and LED lighting in museums could be used to guide visitors through an enriched tour of the displays and exhibits," said Michel Germe, CEO of Luciom. "Working again with Leti, we will be able to bring new, bidirectional transceivers that enable these applications to market in 2015."

"Luciom was one of the first companies to see that LEDs and LiFi can offer a powerful, secure and highly energy-efficient communications alternative to WiFi," said Leti CEO Laurent Malier. "With Leti's first proof of concept developed earlier this year and its expertise in RF communications, we expect data-transmission rates in excess of 100Mb/s with traditional lighting based on LED lamps."

Intematix and SABIC Collaborate on Remote Phosphor Lighting
LIGHTimes News Staff

September 11, 2014...Intematix Corporation, a maker of phosphor solutions for LED lighting, has collaborated with SABIC’s Innovative Plastics business to create the ChromaLit Linear. The ChromaLit Linear uses Intematix's remote phosphor technology and SABIC’s LEXAN™ LUX resins. According to Intematix, the ChromaLit Linear has increased optical efficiency and better light uniformity than conventional LED luminaires.

“SABIC is excited to have worked with Intematix to design a solution that successfully addresses a historic challenge with LED lighting used in commercial applications. In addition to being more efficient, the new LED system can be both extruded and injection molded,” said Venugopal Koka, director of electrical industrial and lighting marketing for SABIC’s Innovative Plastics business. “Our collaboration and combined expertise in both material and LED technology has enabled the development of this solution that brings uniform lighting and potential system cost savings to an expanded set of LED applications.”

The system uses remote phosphor (phosphor that is not directly on an LED) and a blue LED energy source. The blue light excites the independently positioned phosphor to emit white light. Intematix contends that when the phosphor has been separated from the energy source it results in better lighting uniformity and consistency. Intematix selected SABIC’s LUX transparent, diffusion and reflective grades of Lexan plastic for their ChromaLit Linear remote phosphor product.

The LEXAN LUX base material provides a UL94 flame rating of V0. The ChromaLit Linear product delivers naturally uniform, high-quality light with conversion efficacy of up to 215 lumens per radiant watt or up to 163 lumens per system watt when used with the most efficient blue LEDs available.

“We are excited about continuing our close relationship with SABIC,” said Mark Swoboda, CEO for Intematix. “We expect a whole new set of valuable remote phosphor solutions emerging as we draw upon SABIC’s world-class expertise in advanced thermoplastics. Our experience has demonstrated that bringing our two companies’ innovations together results in ground-breaking products that accelerate market adoption of LED-based lighting systems.”

SABIC’s Innovative Plastics business and Intematix plan to continue collaborating to develop new technology to help enable lighting OEMs to take advantage of expanded remote phosphor solutions for solid-state lighting (SSL). Intematix says that its continued collaboration with SABIC will further combine their complementary expertise.

Everlight Adds High CRI LEDs for Natural Light Technology Campaign
LIGHTimes News Staff

September 11, 2014...Everlight of Shulin, Taiwan, reports that it is supplementing its LED Lighting product portfolio, which currently features a CRI of >80Ra, with higher CRI versions. The new Natural Light LED models will have a CRI >95Ra, averaging 98Ra. The company is ultimately targeting 100 CRI. Everlight's first LED series to implement the Natural Light Technology is the new 3-50W Ceramic COBs (JU Series) and Metal PCB COBs (XUAN Series). All other LEDs will have Natural Light versions in Q4of 2014.

LG Innotek Launches AC Direct LED Lighting Modules and Packages
SSL Design News Staff

September 11, 2014...LG Innotek of Seoul, Korea, announced that the company is beginning to produce Alternating Current (AC) direct LED lighting packages and modules. On the surface, these appear to be similar at least in function to the Acrich modules from another Seoul-based company, Seoul Semiconductor.

The company points out that AC direct LEDs rely on alternating current, the standard power format for lighting in homes, offices, hospitality, and retail. Conventional LED lighting uses Direct Current (DC) with Switched Mode Power Supply (SMPS) units. SMPS units reportedly add cost and complexity to the system.

The AC direct LED from LG Innotek embeds a micro-drive integrated chip in the LED that controls the current. The company notes that this allows the LED solution to occupy a smaller space than conventional LED solutions that require SMPS units. LG Innotek contends that it can reduce costs by up to 30 percent compared to conventional DC LED solutions.

LG Innotek is debuting a range of eight products. These products include five types of AC direct LED packages and three types of lighting modules (a packaged LED with an integrated circuit board). The company plans to market three more AC LED modules and two more AC LED packages this year.

AC direct LED packages include the 5250HV(High Voltage), 3030HV and the 5630 HV. The 5630HV operates at about 136lm/W. The company claims that it achieves the world’s highest efficacy for an AC LED. The company optimized the 3030 HV package for micro bulbs like G9 and G4. The 5630 HV and 5250 HV type packages have received LM80 certification, the U.S. reliability test standard for LED lighting.

The AC direct modules are ideal for down lighting. The company's AC direct LED modules provide light efficiency of 125lm/W, which the company claims is the best performance in 23W category. The AC direct modules have a CRI above 80 with an optimized light pattern design for excellent light uniformity. AC direct modules for down lighting avoid dark spots with a uniform light distribution from a light source placed in the center. The modules also have built-in connectors to the power source.

A surge protection circuit is embedded in the AC direct modules for bulbs. The AC module for bulbs is ideal for lighting applications requiring size optimization because it does not require auxiliary circuits and has a lower cost than LED modules that do require one. The company plans to offer a 3030W HV package optimized for omnidirectional bulbs as well as bulb modules and surface modules later this year.

Toshiba Launches 1W GaN-on-Si White LEDs
LIGHTimes News Staff

September 11, 2014...Toshiba Electronics Europe of Düsseldorf, Germany (TEE) has added new gallium nitride on silicon GaN-on-Si LEDs to its LETERAS family of white LEDs. The new LEDs have a standard 3535 lens type package. Unlike most conventional LEDs produced on sapphire substrates, Toshiba says that it fabricates its GaN LEDs on 200 mm silicon wafers. The TL1L3 series of 1.0W LEDs have a package measure 3.5mm x 3.5mm and have a height (including the lens) of merely 2.42mm and offer typical luminous flux of 112-145 lumens, depending on the correlated color temperature (CCT).

Toshiba says that TL1L3 series LEDs are suitable for lamps, down lights, ceiling lights, tube lights, in addition to floodlights and street lights. The seven new members of the new TL1L3 LED series offer color temperatures ranging from 2700K to 6500K. Minimum colour rendering index (Ra) ratings of up to 80 contribute to natural-looking lighting across all target applications. Toshiba says that a low typical forward voltage (VF) of just 2.85V (at a forward current of 350mA) helps to keep power consumption to a minimum. TL1L3 LEDs are rated for operating temperatures between -40°C and 100°C and have a maximum power dissipation of 3.4W. They also offer a very low typical thermal resistance Rth(j-s) from LED junction to solderpoint of only 5°C/W, adds the firm.

Fraen Creates Optics with multi-TIR Nested Lenses for COB LEDs
LIGHTimes News Staff

September 9, 2014...Fraen Corporation of Reading, Massachusetts USA, has recently added Multi-TIR Nested Lens Technology for COB LEDs to its offering of standard optical products. The low profile, multi-TIR nested lens creates a narrow beam when used with a range of Chip-On-Board (COB) LEDs. The patent pending technology can significantly reduce the optic height compared to reflectors with similar optical performance while providing maximum on-axis intensity with reduced spill.

According to Fraen, its patent pending nested TIR lens technology ideal for COB LED applications, especially those requiring narrow beam patterns. Fraen asserts that the compact design can produce an efficient well-collimated beam, which standard TIRs and reflectors cannot achieve. The company claims that the lens can reduce weight and the overall optic height as well as reducing cost. In addition, Fraen notes that the new multi-TIR nested lens can reduce off-axis glare and deliver higher center-beam candela per lumen.

Smples of the company's new technology are available now.

Samsung Creating New Ultra HD TV with 300 LEDs

September 9, 2014...Samsung Electronics is creating a new Ultra HD TV equipped with a 300 LED direct-type LED backlit unit, according to a Digitimes article, which cited supply chain sources. The new TV is reportedly expected to help compete against OLED TVs in the high-end TV market. Samsung hopes the TV will help meet expected demand for Ultra HD TVs in 2015.The company plans to enhance the resolution and color quality of the TV using increased LEDs, an improved color filter, and local dimming technology.

Daktronics to Provide New HD Video Displays at the Palace of Auburn Hills
LIGHTimes News Staff

September 9, 2014...The Palace of Auburn Hills, home of the Detroit Pistons, has gotten a new high definition centerhung display system as well as ribbon and auxiliary displays from Daktronics. Daktronics of Brookings, South Dakota, has partnered with Palace Sports & Entertainment to provide the new display systems and repurposed audio system for the 21,231-seat, multi-purpose arena in Auburn Hills, Michigan. The display installation is the fourth stage of the facility's three-year capital improvement plan.

"As a long-term partner of the Detroit Pistons and The Palace of Auburn Hills, Daktronics is proud to be part of the vision of excellence and very excited to be supplying the new HD video screens," said national sales manager Will Ellerbruch."The Daktronics screens will supply a crystal clear HD view of the game and enhance the entire game-day experience for Pistons fans. Our control system will help immerse the fans with eye-popping video along with the two 360-degree LED ribbon boards that will surround the fans with unprecedented entertainment. We are very much looking forward to fall and another great year of basketball."

The 56,000 pound custom-designed sound and video display system is scheduled for completion by early November for the 2014-15 NBA season. The centerhung features four convex high definition video displays along with two lower sideline facing displays.

The rectangular centerhung system boasts two displays facing the sidelines that each measure 24 feet high by 42 feet wide and feature 6 millimeter line spacing. They provide 1080p HD imagery. Each of the two displays facing the baseline measure 16 feet high by 27.5 feet wide and features 6 millimeter line spacing to provide 720p HD imagery. The centerhung installation combines for 2,896 square feet of active display area.

Two additional video displays will be angled out from the bottom of the centerhung setup to appeal to fans, players and coaches that are close to the action and courtside. Each display will have 6 millimeter line spacing and will measure about 8.5 feet high by 16 feet wide. These two displays will supplement content shown from the main video displays.

"We are pleased to enhance the visual experience of sporting and entertainment events at The Palace with the installation of a new high definition video system," said Dennis Mannion, CEO of Palace Sports & Entertainment. "Multi-million dollar renovations and technological upgrades at The Palace support the vision of our owner Tom Gores and his commitment to providing our fans with one of the most innovative, technologically advanced facilities in the country."

The existing audio system will be repurposed and integrated with the video and scoring system at The Palace. This system provides full-range sound reproduction and delivers clear speech.

The installation also includes a fascia display measuring about 2.5 feet high by 984 feet wide. Two end fascia displays measure about 6 feet high by 80 feet, and two ribbon displays measure about 3 feet high by 535 feet wide. Thirty vomitory displays measuring 3.5 feet high by 4.5 feet wide are throughout The Palace. All of the displays have 15 millimeter line spacing and can be used to deliver statistics, additional game information, animations, and sponsor messages.

The company will also include its Show Control system, a production solution, which combines display control software, video processing, data integration and playback hardware. The Show Control System can control all video displays in the arena from a centralized control room.

Daktronics will also supply two Lapeer Road Palace marquees with 16 millimeter line spacing, each about 18.5 feet high by 25.5 feet wide. The displays will include multiple levels of protection from the outdoor elements.

Veeco Introduces EPIK700 MOCVD System for LED Production
LIGHTimes News Staff

September 4, 2014...Veeco Instruments Inc. of Plainview, New York USA, launched the new TurboDisc® EPIK700™ Gallium Nitride (GaN) metal organic chemical vapor deposition (MOCVD) system. The company boasts that the EPIK700 combines the industry’s highest productivity and best-in-class yields with low cost of operation. Veeco says that the EPIK700 system further enables lower manufacturing costs for LEDs for general lighting applications. Veeco also claims that the EPIK700 MOCVD system enables customers to achieve a cost per wafer savings of up to 20 percent compared to previous generations.

According to Veeco, the savings results from improved wafer uniformity, reduced operating expenses, and increased productivity. The EPIK700 system has reactor with more than double the capacity of current generation reactors. The increased volume and productivity advancements within the reactor result in a 2.5x throughput advantage over previous generation MOCVD systems.

The EPIK700 system is available in one-and two-reactor configurations and features new technologies including the company's IsoFlange™ center injection flow and TruHeat™ wafer coil that offer homogeneous laminar flow and uniform temperature profile across the entire wafer carrier. EPIK700 accommodates 31x4”, 12x6” and 6x8” wafer carrier sizes. Veeco asserts that customers can easily transfer processes from existing TurboDisc systems to the new EPIK700 MOCVD platform for production of LEDs.

“The EPIK700 is our latest in a distinguished line of technologically advanced MOCVD reactors,” said William J. Miller , Ph.D., executive vice president, Veeco. “We are pleased to say that one of the world’s top LED manufacturers has thoroughly evaluated and accepted the EPIK700 due to its production worthiness, stable process and reproducible results. We anticipate that this new product will help our customers further succeed in the solid-state lighting market, by driving down LED manufacturing costs and increasing productivity.”

“The EPIK700 is another game-changer for the LED industry,” said Jim Jenson , senior vice president and general manager, Veeco MOCVD. “In addition to higher capacity and throughput, the system contains proprietary technologies within the reactor that improve wavelength uniformity and drive higher yields in a tighter bin. By combining the advanced TurboDisc reactor design with excellent uniformity, higher productivity, proven automation, low consumable costs and improved footprint efficiency, we have significantly improved the cost per wafer for our customers.”

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Commentary & Perspective...

What We Can and What We Still Cannot Do with LEDs
Scott McMahan - SSLDesign News Editor

September 11, 2014...In recent years, the LED makers have raised the bar on performance of their LED chips and modules. One of the biggest changes has been in lumens per dollar. In both the high-power and mid-power LED chips and modules. Cree, Osram, and Philips have been at the forefront of this trend. It has always been possible to put more LEDs together to get more lumens total output. Constraints of production cost have made adding lots of LED chips somewhat prohibitive in many applications. In certain applications such as spotlights, the form factor desired makes having a single LED chip the best solution.

The industry has convincingly produced LED-based replacements for most incandescent bulbs that offer a valuable return on investment. Some of these even have high CRI of more than 90.

Companies have also begun making single LEDs and multi-chip LED modules with tighter beam angles. Cree has taken the lead in this realm. Cree went so far as to suggest its own metric called Optical Control Factor. (See Guest Editorial).

Optical Control Factor (OCF) is a suggested metric created by Cree that goes beyond lumen density to include the number of lumens over the total light emitting area of multiple chips (minus a certain control factor for overlap). According to Paul Scheidt at Cree, “OCF can be simply described as the ratio of lumens over a scaled area, measured in square millimeters:

For a chip-on-board array, scaled area means the area of the light emitting surface (i.e., pi x radius-squared for a circle).

For a discrete LED, such as Cree’s recent high-density XLamp® XP-L LED, scaled area means adding 0.5 mm to each side of the package and then calculating the area.”

Scheidt points out that in a recent DOE CALiPER report, only one LED-based MR16 lamp was equivalent to its halogen equivalent in terms of lumens output, light distribution and CRI. Only 10 percent of MR16 had the required 90+ CRI.

Scheidt further notes that LEDs are even further from being able to comparatively replace 50W directional ceramic metal halide-based MR16 lamps because the 50W metal halide MR16s have even better performance than 50 Watt halogens.

Scheidt said, “... 100 percent adoption of LED technology isn’t going to happen for indoor directional lighting until we, as an industry, can crack the code on controlling beams of LED light as well as halogen or CMH lights can.”

Cree came out with its new replacement for 50 Watt halogen MR16 lamps. However, this lamp is still not truly equivalent to the higher lumen 50 CMH MR16 lamps (See article). You can bet that Cree and others are working on it. Osram and Philips have also been making inroads in this area with the release of LED light engines designed for higher CRI and spot lights. While, LED lighting has come a long way in its capabilities, it still has some way to go to replace all conventional lighting applications including high CRI and directional luminaires.

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