2008-04-14

Re-lighting the world: LED Advantages

Scientists are developing solid-state light devices, made of light emitting diodes (LEDs), to replace the energy-wasting light bulb. LED Advantages
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2008-04-11

Some Commonly Used LED Circuit Connection Modes

Dozens of and even hundreds of LEDs need to be connected together to form a light emitting device in commercial practices. The connection mode of LED load circuit will directly influence the reliability and life-span of the LED. The LED circuit which can work safely has the following 2 basic functions: to keep the current constant and to maintain low power consumption for the circuit itself. Only in this way can the LED system efficiency stays in a higher level.
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2008-04-09

A Brief Discussion on the Advantages of Automotive LED Application

LED is made up of a very small chip packaged in the epoxy resin. Generally, the operating voltage is 2-3.6V and the operating current is 0.02-0.03A. Traditional incandescent lamp emits light depending on tungsten filament, and the power-saving lamp depends on tricolor powder. Different from these two kinds of lamps, LED emits light through electric field. Long lifespan, high efficiency, absence of radiation and energy saving is the advantages of LED light. These advantages destined it to replace traditional light sources and to be used extensively.
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2008-04-08

Will LED-backlit LCD TVs Break into Mass Market?

LED-backlit LCD TVs, enabled by Dolby Laboratories' High Dynamic Range (HDR) technology, produce stunningly clear pictures. Unclear, though, is how much consumers will have to pay for that kind of picture quality. "These products have been screaming to get out to a mass market," said Eric Haruki, research director for TV markets and technologies at IDC. But he cautioned that unless LED manufacturers can achieve the economies of scale and cut the cost of LEDs, "this could still remain a great white hope for awhile."
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2008-04-03

Factors Influencing Luminous Efficacy of WLEDs

Currently, the luminous efficacy of power LEDs is around 50lm/W (lumens/watt), which does not meet the requirements for home lighting. Therefore, many problems remain to be tackled to boost the power WLEDs (White LEDs) into home lighting, of which the luminous efficacy is the key factor. Although there are many factors which can influence the luminous efficacy of WLEDs, the following ones are worth paying attention to.
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2008-04-01

Five Problems Concerning White LED Lights

1. Bad Color RenderingCurrently, a white LED produced from a blue LED covered with yellow phosphor generally has bad color rendering (below 80%), as the emitted light lacks red and does not restore this color correctly. But a TL tube or a compact fluorescent lamp may have color rendering indices from 80% to more than 90%.
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2008-04-01

Designing with High-power LEDs on Epoxy-glass Boards

Learn the fundamentals of thermal design and how it can be implemented using practical methods and materials to produce acceptable high-power LED applications.LED manufacturers are experts regarding the thermal design inside of the LED package. They can provide the relevant data to describe the thermal performance, and they also have good ideas about how an LED should be soldered to the circuit board. But when it comes to the thermal path between the LED leads and the environment, you are on your own.
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2008-03-31

LED Lights Bring Glimmer of Hope

The technology of LED is able to convert electricity with virtually no waste heat.The acronym stands for light emitting diode, and this technology uses a tiny fraction of energy consumed by conventional incandescent and fluorescent bulbs for a given amount of light. The working life of LED lights is measured in tens of thousands of hours, too.  LED technology is poised to boost the energy efficiency and reliability of area lighting in a big way. Poised, but not quite there yet for all applications.
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2008-03-26

New DLED36 Tri-Brick from Elation Utilizes Revolutionary Tri-Color LED Technology

Elation Professional has made a major breakthrough in RGB LED fixtures: the introduction of tri-color LEDs. Instead of each LED lamp being a single color, the new tri-color technology makes it possible for each lens to contain a combination of three 1-watt LEDs — red, green and blue. This advanced 3-color innovation gives users tremendous advantages over single-color LEDs, including improved RGB color mixing, the elimination of multi-color shadows, and a much brighter, more even field.
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2008-03-26

HB LED Drivers Handle Long LED Strings

Maxim Integrated Products has introduced the MAX16815/MAX16828/MAX16835/MAX16836 high-voltage, linear high-brightness LED (HB LED) drivers capable of driving a long string of HB LEDs from a 6.5V to 40V input supply.
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2008-03-25

ITC Investigating Blue LED/Laser Patent Infringement Case

The US International Trade Commission (ITC) has agreed to institute an investigation based on a complaint filed on 20 February by Gertrude Neumark Rothschild, professor emeritus of Materials Science and Engineering at Columbia University.
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2008-03-17

LEDs Shine in Solid-State Lighting

The use of LEDs for solid-state lighting, rather than as indicators, is poised to make inroads in applications in the automotive, architectural and general illumination markets, according to market analysis firm Yole Developpement. But for the growth to pan out, particularly in the general illumination market, there is still technical work to be accomplished. Although LEDs are prized for their energy efficiency, a great deal of color performance and design and cost optimization remains to be done, and semiconductor companies need to keep improving manufacturing processes.
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2008-03-17

LED Driver ICs: Application Drivers, Technology Developments & Product Introduction Trends

Driven in the short-run primarily by mobile phone handsets, the worldwide white light-emitting diode (LED) market is projected to exceed 20 billion units in 2008. Using higher light-emitting efficiency and lower pricing, an increasing number of white LEDs are being used as backlight for notebook PCs, medium and large LCD TVs, and single-color and full-color outdoor signs. Further growth is expected to come from automotive applications, which are expected to see increased penetration in LED headlamps, as well as LEDs in interior lighting.
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2008-03-13

Benefits and Advantages of LED Over Standard Bulbs

We've likely all experienced the bothersome inconvenience of having to change a light bulb located in a hard-to-reach place. Maybe a lofty porch light burns out, or a chandelier bulb dies. These can be difficult to get to, and many times they are lights that are left on for many hours throughout the day, so they burn out frequently. Luckily, www.besthomeledlighting.com provides a solution in the form of LED light bulbs. This growing technology offers benefits and advantages over standard bulbs in almost every possible category.
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2008-03-10

Replacement of Conventional Light Sources by LED

The latest LED technology opens up wide areas for new applications, new technical possibilities and reduced costs. The main advantages of the state of the art LED light sources are:
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2008-03-06

New Application for LED—LED Printer

What is an LED printer? LED printer was firstly invented by the Okidata co. in Japan and has been put into use for a period of time. Currently, it is developed and manufactured mostly by Japanese companies. The cost of LED printer is lower than laser printer, which scans the information onto the rotating drum through light with high energy and fixed wave band.
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2008-03-04

Bright Future Forecast for Innovative LED Lighting

The success of ScreenSign Arts Ltd's Photometric Edge Lighting Technology, using LED components, suggests it should be possible for the beverage dispensing industry to phase out light bulbs, including mercury-lined fluorescent tubes, sooner rather than later. Christchurch-based ScreenSign Arts began commercialisation of electroluminescence technology in 1998. The company has since negotiated a six-year agreement for distribution of its technology into the beverage sector in North America and Europe.
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2008-02-26

OKI Printing Solutions' Groundbreaking LED Technology is Recognized in Japanese Industry Award

On Mon, 25 Feb 2008, OKI Printing Solutions announced that its revolutionary Epi Film Bonding (EFB) technology has been awarded the most prestigious New Machinery Promotion Award by the Minister of Economy, Trade and Industry (METI) in Japan. EFB has been specifically designed to support OKI Printing Solutions' unique LED printheads. EFB provides an enhancement to the existing LED technology and it reaffirms the company’s position as an innovator and pioneer for adopting LED technology for printers. Benefits of EFB technology:
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2008-02-26

The Luminous Intensity of LEDs

1. Luminance Units1) The unit of Illuminance: Lux (lx)2) The unit of Luminous Flux: Lumen (lm)3) The unit of Luminous Intensity: Candela (cd)The candela is the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 540 ×1012 hertz and that has a radiant intensity in that direction of 1/683 watt per steradian.The energy density striking an object is given in lumens per square meter, generally known as lux.
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2008-02-25

The Benefits of LED Lighting

For now, LED light fixtures are substantially more expensive than their glass competitors. But LED lighting brings significant advantages that Ruud Lighting executives think will steadily steer the industry toward LED — and toward Ruud.Those advantages include:A Energy savings. LEDs are about 50 percent more efficient than high-pressure sodium or metal halide, 35 percent more than fluorescent and 80 percent more than incandescent, said Christopher Ruud, executive vice president for national accounts at Ruud Lighting.
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2008-02-19

Basic Knowledge about Different Kinds of LED Power Supplies

Although LED’s power saving efficiency is higher than ordinary light sources, it can not be connected directly to public grid voltage like those ordinary ones. It should be configured with special voltage switching device which can supply it with rated voltage and current, providing a sound condition for it to function in normally. That is the so-called special power supply for LED.
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2008-02-18

A View on Categories of WLEDs

As we all know, a combination of red, green and blue lights can produce the impression of white light. So does a combination of blue and yellow lights. Most white LEDs (WLEDs) in production today are based on the technology of blue LEDs.1. Mixing the light produced by red, green and blue LEDs to achieve the white light.
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2008-02-18

Many Patents Will Expire in 2010, LED Market Would Be Reformed

It’s forecasted that all the patents related to LED issued since 1990 will expire from 2010 in succession. The former patent structure will have to be adjusted by then, which may lead to reforming LED market. Take Japan for example, which ranks No.1 in LED industry. Nichia had been issued 74 patents from 1991 to 2001, covering LED fabrication, epitaxial wafer, chip manufacturing, chip packaging, processing technology and raw materials such as phosphors, etc. By means of its patents, Nichia monopolized the LED market before the year of 2002 and enjoyed high gross margin.
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2008-01-10

LED Streetlights Cooling Design

When it comes to LED lights, many people focus on lumens and pay less attention to cooling.  In fact, LED lumens are increasing rapidly.  In 2006, lumens per watt in mass production reached 50 and it is still going up fast.  Heat transfer theory has matured, its channels are clear: conduction, convection, radiation and phase change (such as heat pipes).
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2008-01-10

LED and Smart Lighting System

With the improvement of material and spiritual life, people nowadays have more demands to lighting. It is no longer just about lighting. Besides energy-saving, more and more people are using lights to create a harmonious, homey and comfortable environment. 
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2007-12-20

Advantages and Weaknesses of LED Application

Unlike conventional incandescent lamps which need to convert the electricity into thermal energy first and then to light, LED illumination is achieved when a semiconductor crystal is activated so that it directly produces visible light in a desired wavelength range. With the continuous development of lighting technologies, more possible future applications of LEDs will be seen. Advantages and disadvantages of using LEDs are to be discussed as follows. Advantages of LEDs 1. Long Lifespan
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Lumileds introduced the LUXEON MX, a multi-die emitter that delivers industry leading efficiency and flux for outdoor fixtures and high bay lighting applications. Lighting fixtures benefit from the emitter’s 1,200 lumen, 150 lm/W ef... READ MORE

The trading portfolio of IMM Photonics has been expanded in the segment Fabry-Perot laser diodes to include a 830 nanometer (nm) version by the Japanese manufacturer QD-Laser.

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