Wednesday, 31 March 2010
The new AC-DC controllers offer primary-side sensing with tight LED current regulation, eliminating the need for opto-isolation and other secondary-side control circuitry. This technique minimizes component count to reduce board space, power consumption, and overall BOM costs compared to other isolated solutions. The new controllers also feature circuit protection not normally available with other primary-side control solutions. The built-in protection features include over-voltage protection (OVP), output short circuit protection (OSCP), peak current limit protection (PCLP), current-sense resistor short protection (CSSP), and over-temperature protection (OTP). Reference designs for both the CY8CLEDAC01 and CY8CLEDAC02, including all schematics, BOM, gerber files, and documentation to create a power supply for a fully functional LED retrofit bulb, are available at www.cypress.com/go/acdc.
The new AC-DC controllers expand Cypress' lighting portfolio to effectively cover LED retrofit bulbs. They complement the PowerPSoC family of embedded power controllers, the industry's first single-chip solution for both controlling and driving high-power LEDs. Together, the AC-DC family and Cypress's PowerPSoC family cover a wide range of LED applications, from LED retrofit bulbs to high-end LED luminaires that require a variety of functions (communications, diagnostics, color-changing, etc). Cypress will demonstrate the AC-DC controllers, the PowerPSoC solution and its newly announced Powerline Communication solution at the Light+Building exhibition from April 11-16 in Hall 4, Stand E15 at the Frankfurt Fair and Exhibition Center in Frankfurt, Germany.
Tuesday, 30 March 2010
Monday, 29 March 2010
LED holiday lighting uses approximately 90-95% less electricity than the older, conventional incandescent holiday lights. San Franciscan shopping districts including Union Square, Maiden Lane, the Fillmore Merchants and the Divisadero Corridor are already using LED holiday lights, showing their support for the environmentally friendly lighting product.
According to principal Mark McGinty, Smart Strands “was developed to help installers, municipalities and other businesses nationwide afford the transition from incandescent strands to LED strands. For the past few years, the biggest hurdles to transitioning over to LED lights have been the pricing and the look. To address these issues, Smart Strands has created a line of warm white LED holiday lights with a greater resemblance to the traditional incandescent strands. As well, our research and design team has created a pure white LED strand that reminds us of the color of white snow. We offer all of our products at excellent prices because we care about the environment and our aim is to help installers nationwide become 100% planet friendly.” According to San Francisco´s utility company, Pacific Gas & Electric (PG&E), operating 300 C6 LED lights for 5 hours a day for 45 days, will cost approximately $0.43 for the entire time. Alternatively, 300 mini incandescent lights for the same time would cost $4.50 in energy.
Vibrabright LED bulbs from Matrix lighting use 80-90% less energy than an incandescent bulb, but without the nasty mercury issues associated with CFLs. According to a statement, these bulbs were designed with standard light bulb cases in order to fit most existing indoor sockets, and will last over 10 years at an average use of 5 hours per day.
Friday, 26 March 2010
whittling down costs, making them a more practical choice. The latest advancement comes from LED maker Bridgelux, offering a new LED light for just $20.
Thursday, 25 March 2010
MICO 50, a new projector that uses three high power LEDs as the light source instead of the traditional projector lamp. SIM2 claims that the Grand Cinema MICO 50 sports PureLED technology, a combination of 3 high-powered LEDs, the latest DLP chipset, advanced video processing and a new light engine.
announce a new strategic corporate partnership that could reduce the cost and time to market for its solid-state lighting (SSL) products. CEO Bill Watkins told the Cleantech Group that Bridgelux has jointly developed the Helieon Sustainable Light Module with Lisle, Ill.-based Molex, a 71-year-old manufacturer of electronic, electrical and fiber optic interconnection systems. The partners created a fixture-mounted light-emitting diode (LED) product that is sold to lamp and lighting fixture companies to incorporate in luminaires.
Wednesday, 24 March 2010
pulled the plug on its production of general-use incandescent bulbs, a product which Toshiba was first to manufacture in Japan and that it has produced for 120 years. The company decided to focus on environmentally-friendly lighting in 2008, and since then has been advancing a transition to new lighting products, particularly LED lighting.
Tuesday, 23 March 2010
illuminate computer laptop keyboards in low light environments, and the newest addition to Mighty Bright’s line of portable LED lights. The Mighty Bright LED USB Light is portable, adjustable, and environmentally friendly. The compact and flexible LED USB Light is perfect for traveling, folding and fitting easily into laptop bags. Available in two models featuring one or two durable and long lasting LEDs, the LED USB Light requires no batteries, and plugs into any standard Type A USB port for full keyboard illumination.
Monday, 22 March 2010
One of the most critical parameters of semiconductors that determine the feasibility for these technologies is the band gap. The band gap of a semiconductor determines, for example, if a given wavelength of sun light is absorbed or left unchanged by the semiconductor in a solar cell. Band gap also determines what color of light an LED emits. To make solar cells more efficient, it's necessary to increase the range of band gaps. Ideally, the highest solar cell efficiency is achieved by having a wide range of band gaps that matches the entire solar spectrum, explains Ning, a professor in the School of Electrical, Computer and Energy Engineering, a part of ASU's Ira A. Fulton Schools of Engineering.
In LED lighting applications, he says, more available band gaps means more colors can be emitted, providing more flexibility in color engineering or color rendering of light. For example, different proportions of red, green and blue colors would mix with different white colors. More flexibility would allow white color to be adjusted to suit various situations, or individual preferences. Similarly, Ning says, detection of different colors requires semiconductors of different band gaps. The more band gaps that are available, the more information can be acquired about an object to be detected. Thus, all of these lighting applications can be improved by having semiconductors with a wide range of band gaps. The researchers say the hurdle is that every manmade or naturally occurring semiconductor has only a specific band gap. One standard way to broaden the range of band gaps is to alloy two or more semiconductors. By adjusting the relative proportion of two semiconductors in an alloy, it's possible to develop new band gaps between those of the two semiconductors. But accomplishing this requires a condition called lattice constant matching, which requires similar inter-atomic spaces between two semiconductors to be grown together.
"This is why we cannot grow alloys of arbitrary compositions to achieve arbitrary band gaps," Ning says. "This lack of available band gaps is one of reasons current solar cell efficiency is low, and why we do not have LED lighting colors that can be adjusted for various situations." In recent attempts to grow semiconductor nanowires with "almost" arbitrary band gaps, the research team led by Ning and Pan, an assistant research professor, have used a new approach to produce an extremely wide range of band gaps.
They alloyed two semiconductors, zinc sulfide (ZnS) and cadmium selenide (CdSe) to produce the quaternary semiconductor alloy ZnCdSSe, which produced continuously varying compositions of elements on a single substrate (a material on which a circuit is formed or fabricated). Ning says this the first time a quaternary semiconductor has been produced in the form of a nanowire or nanoparticle. By controlling the spatial variation of various elements and the temperature of a substrate (called the dual-gradient method), the team produced light emissions that ranged from 350 to 720 nanometers on a single substrate only a few centimeters in size. The color spread across the substrate can be controlled to a large degree, and Ning says he believes this dual-gradient method can be more generally applied to produce other alloy semiconductors or expand the band gap range of these alloys. To explore the use of quaternary alloy materials for making photovoltaic cells more efficient, his team has developed a lateral multi-cell design combined with a dispersive concentrator.
top ratings in separate lab reviews. Home Theater Magazine, a nationally renowned consumer electronics publication, recognized the Cine LED projector with a “Top Pick” designation in their April 2010 issue. Additionally, Sound & Vision Magazine gave the Cine LED their coveted “Certified and Recommended” approval in the upcoming April/May 2010 issue. UltimateAVmag.com, a widely recognized web portal specializing in high-performance audio and video electronics, also gave the Cine LED high marks in a recent comprehensive review.
Sunday, 21 March 2010
With confirmation that the Tokyo Tower in Tokyo and Brandenburg Gate in Berlin will both turn off their lights for Earth Hour, all members of the G20 are now taking part in the event.
The Las Vegas Strip, Mount Rushmore, Sea World, the Empire State Building and the Golden Gate Bridge will join other iconic landmarks from around the world in switching off the lights for Earth Hour. CN Tower in Toronto, Grand Palace in Bangkok, Table Mountain in Cape Town, the London Eye, Hiroshima Peace Memorial and Taipei 101 will plunge into darkness to shed light on dangerous climate change. Citizens of the United States will unite with individuals, businesses, civil groups and governments around the world including Athens, Bangkok, Cape Town, Delhi, Dubai, Geneva, Hong Kong, Istanbul, Manila, Moscow, Rome, Seoul, Singapore, Sydney, Tel Aviv and Toronto. Communities will come together like never before with cities such as Stockholm and Hiroshima holding their inaugural Earth Hour. Countries participating in Earth Hour for the first time include: Brunei, Cambodia, Czech Republic, Kosovo, Madagascar, Mauritius, Mongolia, Mozambique, Nepal, Northern Mariana Islands, Oman, Panama, Paraguay, Tanzania, Saudi Arabia, Qatar and the Faroe Islands.
acquired Italy-based Luceplan SpA, which will become part of the Consumer Luminaires business in the Philips Lighting sector. Philips Lighting Consumer Luminaires CEO Allard Bijlsma commented: “With the acquisition of Luceplan we are acquiring an iconic design brand in the premium design segment which enjoys higher growth rates and margins than the overall consumer lighting market.
first foray in the local commercial sector, managing director Jonathan Borg told The Sunday Times.
Unlike fluorescent tubes, LED lights do not flicker creating strain on the eyes. Also, the LED light does not generate UV rays or infrared rays like fluorescents. Primestar LED’s T8 tube is typically more than 50% more efficient than fluorescent T8 tubes, they last for up to 50,000 or more, contain no harmful mercury and improve the quality of the light. To learn more, visit www.primestarLED.com.