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Jeff Walters via LinkedIn


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UL is not needed to sell to utilities in the USA. I have been designing and selling to this market since 1985. UL is not written into any IOU (investor owned utility) specs. Conformance to ANSI C136 standards is required.

UL or ETL or CSA is needed to sell to retail, commercial or industrial market. Needed in the DOT market. Helpful in the municipal streetlight market


UL products are not required for insurance companies to process claims. Nor does the use of UL listed products protect against liability.

UL is a private company. Its use is not required by and Federal, state or local laws.
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The original article and supporting information were published by ACS Applied Materials & Interfaces:
Efficient Phosphorescent polymer Yellow-Light-Emitting Diodes Based on Solution-Processed Small Molecule Electron Transporting Layer
Tengling Ye, Shiyang Shao, Jiangshan Chen, Lixiang Wang, Dongge Ma
DOI: dx.doi.org/10.1021/am1010018
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Research group of Thuc-Quen Nguen at UC Santa Barbara has published a study aimed to design anionic conjugated polyelectrolyte (CPE) that could enable improved temporal response through facilitation of ion motion. Such an improvement would be greatly beneficial for the development of better PLEDs based displays. They had designed their polyelectrolyte to contain ion-conducting polyethylene oxide pendant (PFPEOCO2Na) as electron injection layers (EILs). Pristine PLEDs containing PFPEOCO2Na exhibit luminance response times on the order of tenths of seconds. This delay is attributed to the formation of ordered structures within the CPE film that slow ion migration and therefore result in a longer temporal response time. The researchers have found out that presence of the ethylene oxide units on PFPEOCO2Na did not improve the luminance response times of as cast PLEDs (46s). Yet it is possible to accelerate the response by a combination of thermal and voltage treatments that “lock” ions within the interfaces adjacent to PFPEOCO2Na resulting in the response time of 200 micro seconds (105 fold enhancement). This study may lead to the development of efficient multilayer solution-processable PLEDs with stable high work function cathodes and fast luminance response time.

Original article is published by the Journal of American Chemical Society DOI 10.1021/ja106268w


More...]]> http://ledsreview.com/blogs/alice/30.php "Are there any companies with LED manufacturing facilities in Europe?"

Here is what I've managed to find so far:

• Osram Opto (factory in Regensburg)
  
• Optogan with facility in Dortmund, Germany. Next year they'll start LED manufacturing in Russia.
  
• Tridonic (Austria)
  
• Vossloh-Schwabe Optoelectronic GmbH & Co. -- Factory is located in Kamp-Lintfort, Germany.
  
  

Do you know other companies manufacturing high brightness LED in Europe? Please post in comments.




More...]]> http://ledsreview.com/blogs/editors/29.php The U.S. Department of Energy and its National Renewable Energy Laboratory (NREL) have released two technical reports that provide recommendations on how to achieve 50% energy savings in large office buildings and large hospitals.

Technical Support Document: Strategies for 50% Energy Savings in Large Office Buildings evaluates the potential for new large office buildings to achieve a 50% net onsite energy savings compared to a baseline standard (as defined by ANSI/ASHRAE/IESNA Standard 90.1-2004). The report found 50% energy savings can be achieved in both low-rise and high-rise office buildings in a broad range of U.S. climates. The analysis was conducted in 16 cities that represented different climate zones, such as hot and humid, hot and dry, marine, cold and humid, and cold and dry. The following energy-efficiency measures helped researchers reach the 50% energy-savings target:


•Lighting power density was reduced in office spaces and occupancy sensors were used in infrequently occupied spaces.
•High-efficiency boilers, chillers, air distribution units, and service water heating equipment were installed.
•Plug loads were reduced by purchasing high-efficiency electronic equipment and using special controls that shut off equipment when not in use.

Large Hospital 50% Energy Savings: Technical Support Document details the technical analysis performed and the resulting design guidance that will enable large hospitals to achieve whole-building energy savings of at least 50% over the above standard. The large hospitals report also documents the modeling methods used to demonstrate how the design recommendations will help institutions meet or exceed the 50% energy-savings goal. This report found 50% energy savings can be achieved in large hospitals across all eight U.S. climate zones. Energy savings range from 50.6% to 61.3%, with the smallest savings in humid climates and extremely cold climates. The highest energy savings were achieved in marine climates, with relatively high energy savings achieved in dry climates. In general, for each climate type (humid, marine, and arid), savings were seen to decrease as the climate became progressively colder.

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In paper published Thursday in the Journal of Physics D, researchers from Sandia National Laboratories argue cheap efficient lighting can increase consumption.

"Presented with the availability of cheaper light, humans may use more of it, as has happened over recent centuries with remarkable consistency following other lighting innovations," said Sandia lead researcher Jeff Tsao.

Comment: America is bathing in cheap electricity, compared to many European countries. To prevent excessive light usage energy tariffs should be increased gradually. It will make migration to energy efficient appliances faster and economically reasonable. It's still hard to convince consumers to buy expensive LED lighting in order to save $10 on electricity bill.

What do you think?


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Some US cities are turning OFF their streetlights to save costs.

Scottsburg, Indiana is switching to Light Emitting Plasma [LEP] from LUXIM.

City to save $70,000 a year AND reduce energy consumption by 50%.

City selected LEP for this high-output application, not LEDs.

Fixtures to be made locally by Stray Light Optical Technologies on site of former gasket factory


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Kevin writes in his blog:

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I will be developing a few wall and pendant products as the inspiration leads me. Of course in the course of one week, engineering documentation will be only what I need to execute the prototype, using Rhino CAD to lay out 3D models before making chips, and there will be no UL listing. However, every design will be completed by me including design, engineering, machining, fab, and finishing - which is a lot of fun.
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The first weeks design is already complete and posted with details here.

Specifications
24"L x 20"H x 6"W. Utilizes Lynk Labs 12VAC Tesla LEDs on 12" 12W SnapBrite strip with SnapDriver power supply. The reflector/heat sink extrusion was also provided by Lynk Labs. Custom on-off switch. Black wrinkle body, tumbled aluminum with clear coat, and matte white finishes. All finishes are powder coat.



All of the designs will be made available for sale to fund future work on the project through the Lumenique Product Center for anyone interested.

Nice New Year Resolution, Kevin. Good luck!
More...]]> http://ledsreview.com/blogs/editors/24.php Aixtron reported delivery of their CRIUS® MOCVD system in a 7x4 inch configuration to SemiLEDs. It will be the first 4-inch LED chip line at SemiLEDs' production facility in Taiwan.

Do you know other companies already using 4-inch wafers for HB LED chips?
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