A few Questions one Should Pay Attention to When Purchasing LED Lighting

Obvious energy saving effectiveness, long lifetime, no radiation, no RF interference, no white noise, soft light rays, and a wide operating voltage range are all special features of LED lighting, and becoming well received daily.  As a consumer, how are you able to pick the best product to satisfy your needs with a wide range of LED lights spread out before you?   First is through packaging and trademark. LED lighting products are forced by the country to include the following information on the outside packaging label: voltage rating, voltage range,......
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Process Control Method for Accelerating LED Manufacturing Yield, Agility, and Profitability

Author: Steven Chen, Process Control Solutions Technologist, KLA-Tencor Corporation Introduction LED manufacturing is undergoing a tremendous transformation.  The evolution to high brightness LED, larger wafer size and new complex architectures make LED manufacturing more challenging than ever before.  Even though these trends greatly benefit the advancement of the LED industry in terms of LED efficiency and performance, they can also potentially negatively impact yield.  In order for LED manufacturers to stay competitive in this dynamic environment, they need to have a comprehensive in-line process control strategy to improve the yield to make the solution cost effective. Currently, most LED manufacturers rely on inspection tools to inspect and provide defects of interest (DOI).  Defect density is typically utilized as the gauge for statistical process control (SPC) control.  However, the drawback of this approach is the fact that there can potentially be a lot of nuisance defect that does not cause yield loss.  In looking at a defective wafer through an inspection tool, how do you determine which defects are killer defects that impact the yield or electrical performance, and which defects are nuisance?  How can killer defects be detected at the earliest possible time to prevent costly excursions?  These are the questions that must be addressed properly. 
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Fast and easy growth analysis on Patterned Sapphire Substrates (PSS)

In the next years, the use of PSS will further increase due to its high light extraction efficiency. Following this trend, LayTec‘s in-situ metrology software EpiNet 2 can be individually customized for various kinds of PSS. Our users can expand the substrate database by themselves. LayTec‘s Calibration Manual explains how to measure PSS reflectance in different pockets in one single calibration run. If required, LayTec also offers related customer trainings. Once the initial reflectance values of the PSS substrates are uploaded, the operator can choose the needed substrate in the RunType‘s Material Spec window (Fig. 1). As a result, all PSS wafers can be monitored with the same accuracy as standard sapphire substrates.
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LayTec launches a new version of EpiCurve® TT

A major challenge of in-situ metrology on single-port reactors with small viewport geometries is the combination of curvature measurements by a blue laser with reflectance measurement at 405 nm. The blue laser is a must for patterned sapphire substrates (PSS) and double-side polished substrates.  The 405 nm reflectance is indispensable for monitoring of InGaN MQW growth. Until now, it was impossible to have both features for reactors with only one small optical access because of the cross-talk effect. The new optical and electronic design of EpiCurve® TT eliminates this problem.
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Osram Coordinates a BMBF Project for Developing High-brilliance Infrared Laser Sources

The aim is to increase the performance and lower the costs of laser systems for material processing As part of the ‘Integrated Microphotonics’ initiative, Osram Opto Semiconductors is coordinating the IMOTHEB project (Integrated microoptical and microthermal elements for diode lasers of high brilliance). The aim is to improve the performance of laser systems and at the same time reduce production costs. The project partners are DILAS Diode Laser and the Max Born Institute. The project (FKZ 13N12312) runs from October 1, 2012 to September 30, 2...
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Be Careful of a Mercury Poisoning Disaster Caused by CFL Lightbulb

CFL bulbs contain mercury and when they break in your home a tiny amount of mercury will be released and become a more or less permanent part of your environment. Here’s a little taste of what Health Canada has to say about the dangers of mercury: If mercury is burned, heated, sprinkled or spilled in the home, a poisonous gas can be produced, requiring a clean-up procedure. Your first instinct when you break one of those coiled CFL light bulbs will be to get out the vacuum cleaner. Don’t. Here’s what Health Canada suggests: The amount of mercury found...
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Scientists Inspired by Fireflies to Develop Brighter LED Bulbs

Fireflies have been the source of inspiration for scientists and research groups working on developing better lighting devices for a sustainable future. Using this technology alone, a team of researchers at Syracuse University debuted zero-energy lights. Now an international team of scientists are using nature’s technology to develop LED light bulbs which produce more luminescence using the same amount of energy. In all types of fireflies, the bioluminescence is emitted through the cuticle of their exoskeleton, however, a part of the luminescence is reflected back...
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TI Makes LED Lighting Design Easy and Fast

Industry’s first fully integrated LED drivers in industry-standard IC packages helps developers skirt design complexities Texas Instruments Incorporated (TI) (NASDAQ: TXN) introduced two fully integrated LED driver micro-modules that eliminate the external components and complex layout placement challenges typical of LED driver designs. The 450-mA TPS92550 and TPS92551 DC/DC LED driver modules are the industry’s first to incorporate all the required power and passive circuitry into a single IC package to deliver up to 23W of power to...
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LayTec : Advanced Stress Control of GaN on Silicon(001) with EpiCurve TT during HEMT Growth

The challenges of GaN growth on Si(111), especially for LED growth, are well known and meanwhile controllable. Cooldown-assisted layer cracking as a result of high tensile stress can be prevented and crystal quality can be enhanced by sophisticated interlayers. Numerous institutions worldwide are already using LayTec‘s EpiCurve  TT with advanced curvature resolution for high quality GaN devices on large scale Silicon substrates. Now, this experience is being transferred to growth on Si(001) and Si(110), because GaN based power electronics can be easily in...
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Our Fascination with Fluorescents and the end of the Affair?

Earlier this week, news emerged from the US that researchers have developed a new type of lighting that could replace fluorescent bulbs. The new source is reportedly more efficient, produces a better quality of light and is flicker free. Whilst the concept of light from polymers is certainly intriguing, I was somewhat taken aback by the attention the story received. After all, we already have viable alternatives for the fluorescent tube that does all of the above. So why are we under the impression that we don’t? To understand the context we need to look back. The UK ...
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60V, Synchronous Buck LED Driver Delivers Over 300W of LED Power

Linear Technology announces the LT3763, a synchronous buck LED driver controller that delivers over 300W of LED power. Its 6V to 60V input voltage range makes it ideal for a wide variety of applications, including automotive, industrial and architectural lighting. Similarly, its output voltage can be set from 0V to 55V, enabling it to drive a wide range of LEDs in a single string. The LT3763 offers both input and output current monitors and limiting, which accurately control both input and output current. Similarly, the LT3763 also offers accurate output voltage reg...
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Merck to Use Epson Ink Technology to Manufacture Ink for Large OLED Displays

Merck and Seiko Epson Corporation today announced a cooperation and licensing agreement for inkjet inks used in the manufacture of organic light-emitting diode (OLED) displays. According to the agreement, Epson will supply Merck with ink technology that dissolves Merck’s OLED materials so that they can be used for the production of printable displays used in OLED television screens. Financial terms of the business agreement were not disclosed. The use of inkjet technology for printing OLED displays requires a combination of long-lasting OLED materials a...
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Basics when Designing and Picking Light Sources

Light that is visible to human eyes is simply electromagnetic waves whose wavelength which happens to be in the perceptible range. The unit that we used commonly to measure the energy of light is watts and the quantities we used to describe a light’s characteristics are radiometric. How light is perceived by each one of us is varied, our eyes and brain can give a different perception of a similar light‘s color and brightness. We, the human, are typically responding to light with wavelengths from 380 nm to 780 nm. After the light signal is picked up by our eyes, it gets prett...
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LIFX: The Light Bulb Reinvented

LIFX is a WiFi enabled, multi-color, energy efficient LED light bulb that you control with your iPhone or Android. What is LIFX? LIFX is the smartest light bulb you've ever experienced. It's a wifi-enabled, energy efficient, multi-colored bulb that you control with your iPhone or Android. LIFX gives you unprecedented control of your lights, reduces your energy costs, lasts up to 25 years and delivers an amazing range of experiences we think you’ll love. Sets up in Seconds LIFX is incredibly easy to set-up. Simply replace your existing bu...
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Basic Characteristics of Light Sources

By Scott Watson Light sources such as incandescent lamps, halogens, fluorescents, LEDs and some others have basic characteristics.  They also have their positive and negative aspects.  Actually, there are different kinds of light sources in use all over the world.  None of them has actually proven to be very suitable for all applications.  In this write-up, you’re going to learn more about the positive and negative aspects of the lighting sources. This will help you to get more understanding about LED lighting system.  Let’s have a loo...
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How to choose light bulbs that aren't terrible

Energy-efficient light bulbs can be far from perfect. CFLs can take minutes to achieve full brightness compared with LEDs that brighten instantly, but in tests, one LED was dim and emitted a ghastly, bluish light color, and others couldn't cast light in all directions. Consumer Reports has identified four light bulb letdowns and ways to prevent them. Dim bulbs: Opt for more lumens. Check the lighting facts label on the packages of CFLs and LEDs for the number of lumens. The higher the lumens, the brighter the bulb. Weird light color: Choose the r...
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LEDinside: How to choose the right LED bulb in China market when LED replacement age is coming?

In 2011, the National Development and Reform Commission announced that the ban on the sales of 100W and above incandescent bulbs would take effect in October 1, 2012. As the enforcement day is drawing near, LEDinside believes that now it has become the critical stage for the transition from conventional lighting to LED lighting. As the incandescent products are gradually phasing out and supportive policies of the SSL lighting industry are further introduced and implemented, LED lighting is faced up with a faster development than ever before. Over these years, with th...
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Six Tips about LED Bulbs

1. Incandescents are dead. As manufacturers phase out traditional light bulbs that don't meet new federal standards for efficiency, the first to go are 100-watt bulbs in 2012. The phase-out continues with 75-watt bulbs in 2013 and 60-watt and 40-watt bulbs in 2014. You could substitute halogens or compact fluorescents CFLs, but LEDs will take you straight into the future of lighting. LEDs have been used in flashlights and reading lights for years. 2. Long live LEDs. Well-designed and -manufactured LED bulbs are rated to last 25,000 hours, or at least 22 yea...
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Various Types Bulb Shapes

By Scott Watson In the electronic world, there are varieties of bulbs in use.  Among the popularly used types include fluorescents tubes, LEDs, incandescent lamps, halogens, HIDs and some others. These bulbs   showcase in a variety of shapes and designs.   A clear understanding of the shapes of the bulbs will go a long way to assisting you in understanding their basic features and modes of operation.  Let’s take a look at the various bulb shapes. Pear Shape This is the most standard type of   bulb shape available in the wor...
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Brief History of Lighting

The history of lighting  is quite detailed and long. Lighting systems and sources have actually come a long way. If you must understand the practical aspects of LEDs and other lighting sources, it’s necessary you grab some details about their long history.  All the lighting sources and systems in use today didn’t fall from above. Some individuals somewhere invested their time and energy in invention them.   An attempt is made in this write-up to present a brief history   of how the issue of lighting began in our world. The very first pra...
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Sapphire Wafer Wet vs. Dry Etching

LEDs have a very bright future. According to a market research report published by Strategies Unlimited (SU), the high-brightness (HB) LED market, experienced a 93 percent growth rate between 2009 and 2010. In 2009, the global market for packaged HB LEDs was $5.6 billion. In 2010, it grew to $10.8 billion. SU is predicting that by 2015 the global market will be worth $18.9 billion, representing a compound annual growth rate (CAGR) of 11.8 percent. Despite the positive forecast, there is one element that has the potential to stifle the growth of the LED mar...
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Lighting Systems – Useful Info

Since the invention of light   by the famous scientist, Edison, several  improvements have been made  in the area of lighting.  Several lighting sources and systems have been invented.  Edison gave the world the very first incandescent bulb after he  made several attempts.  His invention   saw  the world depart from the use of candles and kerosene lamps.  His invention also  awakened the giants in the minds of many other scientists.  Several variations of  incandescent light bulbs  were invented after that...
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Introduction to the practical aspects of Light

Ever since the world came to be, light has always remained a very vital part of the universe. Without light, darkness will simply rule the world. The power of light cannot be ignored in any sector of life.   The Sunlight and the moonlight have great impact in our world.   The same scenario holds for electric light.  We can’t do without   incandescent bulbs, fluorescent tubes, LEDs, halogens and other light sources.  In this write-up, the practical aspects of electric lighting systems and sources are discussed. By way of simple defi...
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Practical Characteristics of LEDs

Since their introduction in early 2000s, Light emitting diodes (LEDs) have continued to cause waves in the electric industry.  They are widely known for their uniqueness in generating light in diverse manners.   The LEDs do have practical characteristics.  Getting to know more about that will help you appreciate their function in the electric world.   In this write-up, an attempt is therefore made in discussing the basic practical characteristics of  LEDs. LEDs are current devices LEDs are never voltage devices as some people may t...
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Practical Thermal Management of LEDs

Temperature has tremendous effects on LEDs. This is very evident from the practical thermal behavior seen in the devices.  In any case, there’s a need to discuss how to manage   the thermal effects in order to make the most out of the LEDs. This is exactly the subject matter of this discourse.  There’s a need  to  look at the analytical method used in calculating the  thermal effects as well the  thermal environment in which the LEDs operate in. we’re also going to  discuss the various methods of keeping the LEDs...
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Information on practical DC Drive Circuitry for LEDs

All LEDs are  driven electrically before they can emit quality light.  This is one of their basic characteristics which differentiate them from other kinds of light sources.  In this write-up, we’re going to be focusing on the DC drive circuitry for LEDs. In the first place, the battery is a typical DC source. It’s usually used for flashlights. It can as well serve as the output of a converter.  Actually, DC is quite different from AC.  The difference is that DC has much lower voltage than AC.  Hence, the regulations gov...
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A look at the Practical Thermal Performance of LEDs

LEDs have their basic characteristics.  They are current devices with unique functions.  They also have unique system of operation when they are in use. A look at their practical thermal performance is very vital if you must understand how they operate. This is exactly the major goal of this   write-up. We’re going to be examining the practical thermal performance of LEDs and how it influences their usage in given applications. The Mechanisms behind Thermal Shifts A White LED usually consists of   different components.   I...
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The Future design for the next generation LEDs

By Scott Watson LEDs have continued to evolve as the years roll by.  Lots of exciting designs have been seen in many of them.  The future promises to be more surprising when it comes to LED designs.  In this write-up, we’re going to be examining the future design possibilities expected of the next generation LEDs. Actually, brighter and cheaper LEDs do come up every few months.  All kinds of modern day designing processes are used in manufacturing them.  So many manufacturers have come into the business.  Today, many of our ligh...
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Information on Practical AC Drive Circuitry for LEDs

By Scott Watson Apart from using the DC drive circuitry in some conditions, LEDs also make use of the AC Drive Circuitry.  DC circuitry is powered by batteries while the AC is powered by the electrical current.  In this write-up, we’re going to be discussing some details concerning the practical aspects of AC drive circuitry meant for LEDs. Actually, when your LED light is run off the electrical grid, the AC drive circuitry is simply used.  The power conversion of the AC power is known to be very complex than the DC version.  ...
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Recycling LEDs Becomes a Pressing Issue

What is LED? LED stands for Light-emitting diode, first used in 1968. LED, a semiconductor light source, has been widely adopting for assorted lighting usages and has been slowly replacing incandescent lights over the recent years. Although LED is much more environmental-friendly than traditional lighting fixtures, reusing and recycling LEDs is still a very crucial issue. LED’s Advantages and Applications LED lights have the following edges over incandescent light bulbs: A) LEDs have longer lifespan than that of incandescent light bulbs; the for...
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Today Philips Lumileds launches its proprietary CrispWhite Technology, yet another quality of light breakthrough in its portfolio, making whites appear vivid and bright while colors appear saturated. LUXEON CoB arrays with CrispWhite Technolog... READ MORE

For the first time there is a compact laser multi-chip package. Osram Opto Semiconductors can pack up to 20 blue laser chips in the new PLPM4 450 module. Instead of taking the laborious approach and constructing a light source from individual ... READ MORE