300W的led floodlights 总长度为900厘米，宽为508厘米，采用的芯片类型是Nichia NVSW219，芯片数量为150，功率为300W，光通量（光源单位时间内发出的光能数量成为光通量，符号为φ，单位是流明（lm）光源发出的光通量越大，意味着辐射的能量越多，对人眼引起的感觉越明亮。所以，光通量是衡量光源发光多少的一个指标，是说明光源发光水平的一个量）为29000~33000LM，显色指数为≥70，灯具角度为60/90度，色温（色温是按绝对黑体来定义的，光源的辐射在可见区和绝对黑体的辐射完全相同时，此时黑体的温度就称此光源的色温）为2500～5500K可选，重量为14.8kg±0.4kg,有CE、ETL的认证的环境可靠性测试。包装尺寸为L980mmXW588mmXH210mm。它主要适用于广告、大厦外景、广场、体育馆、展览馆、厂区、停车场、加油站及其它需要照明的场所。E-Lite LED
Thursday, 23 August 2012
Thursday, 2 August 2012
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. It’s technically complicated. There are also various government regulations concerning the EMI emissions in AC drive circuitry. There are some pieces of information you need to know about the AC drive circuitry. Let’s examine them.
Safety
This is the very first thing you must grab about the AC drive circuitry. The AC drive is very deadly. Before ever you do anything with the AC power source, you need to pay attention to given instructions. Whether you’re an electric engineer or a simple user of AC related devices, you need to be careful when work with the AC drive since it can be very dangerous. It’s highly recommended that you procure a kill switch and get it installed in your lab before you ever work on any AC power drive. The Kill switch is a big red button you can install on the doorway. You can easily hit it with your fist while it goes ahead to turn off all the electrical outlets in your lab. The light will still be on to show you the way to go. The kill switch protects you from accidents that may occur as you work with the AC drive power source.
One of the dangerous aspects of AC power is known as fibrillation. It refers to the possibility of your heart muscles twitching in an uncontrollable manner. If for instance you touch one side of the AC line with one hand and also touch the other side with the other hand, you can easily get electrocuted. Again, if you touch the AC line with your hand while you stand barefooted, current can easily flow through your body and your feet to reach the ground. This can easily stop your heat from working.
You must be careful about your safety when you work on any AC drive circuitry meant for LEDs. A simple 5 mA is even more than enough to create unpleasant shock. To get yourself protected, you need to take note of the following tips:
• Make sure you switch off the AC line before you work on any circuit
• Don’t presume anything when you work on an AC circuit. You must make sure the input voltage monitor is reading zero or you simply unplug the power source.
• Always use an isolation transformer to safeguard yourself. The transformer can be a little bit big and made of steel. It has the function of providing isolation between the input AC line and its output. In most cases, the output can be 120 VAC or it can as well be doubled.
• Try using a fuse in your circuit. You can easily get power through the fuse but it has a limited time. It helps you not to stay connected to the AC line for a long period.
• Always keep one of your hands behind your back if you must touch any live circuit. This protects you a lot. If you’re able to keep one hand behind your back, you won’t be able to create a circuit from one arm or across your heart. Your heart can also be protected from the current. You may also hold on to your belt for maximum safety.
• Don’t use cheaters. They are simply AC adapters that convert three prong plugs to 2 prong plug. They claim to offer isolation but in actual fact, they don’t.
• Try using insulation. It’s simply the best safety measure to engage.
• Create a danger sign and put it where people will see it. This will help people to desist from touching the circuit.
• Turn off the circuit especially when going out of the area to do something else. This prevents unnecessary electrocution on anybody coming to see your work when you’re not around.
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. It’s technically complicated. There are also various government regulations concerning the EMI emissions in AC drive circuitry. There are some pieces of information you need to know about the AC drive circuitry. Let’s examine them.
Safety
This is the very first thing you must grab about the AC drive circuitry. The AC drive is very deadly. Before ever you do anything with the AC power source, you need to pay attention to given instructions. Whether you’re an electric engineer or a simple user of AC related devices, you need to be careful when work with the AC drive since it can be very dangerous. It’s highly recommended that you procure a kill switch and get it installed in your lab before you ever work on any AC power drive. The Kill switch is a big red button you can install on the doorway. You can easily hit it with your fist while it goes ahead to turn off all the electrical outlets in your lab. The light will still be on to show you the way to go. The kill switch protects you from accidents that may occur as you work with the AC drive power source.
One of the dangerous aspects of AC power is known as fibrillation. It refers to the possibility of your heart muscles twitching in an uncontrollable manner. If for instance you touch one side of the AC line with one hand and also touch the other side with the other hand, you can easily get electrocuted. Again, if you touch the AC line with your hand while you stand barefooted, current can easily flow through your body and your feet to reach the ground. This can easily stop your heat from working.
You must be careful about your safety when you work on any AC drive circuitry meant for LEDs. A simple 5 mA is even more than enough to create unpleasant shock. To get yourself protected, you need to take note of the following tips:
• Make sure you switch off the AC line before you work on any circuit
• Don’t presume anything when you work on an AC circuit. You must make sure the input voltage monitor is reading zero or you simply unplug the power source.
• Always use an isolation transformer to safeguard yourself. The transformer can be a little bit big and made of steel. It has the function of providing isolation between the input AC line and its output. In most cases, the output can be 120 VAC or it can as well be doubled.
• Try using a fuse in your circuit. You can easily get power through the fuse but it has a limited time. It helps you not to stay connected to the AC line for a long period.
• Always keep one of your hands behind your back if you must touch any live circuit. This protects you a lot. If you’re able to keep one hand behind your back, you won’t be able to create a circuit from one arm or across your heart. Your heart can also be protected from the current. You may also hold on to your belt for maximum safety.
• Don’t use cheaters. They are simply AC adapters that convert three prong plugs to 2 prong plug. They claim to offer isolation but in actual fact, they don’t.
• Try using insulation. It’s simply the best safety measure to engage.
• Create a danger sign and put it where people will see it. This will help people to desist from touching the circuit.
• Turn off the circuit especially when going out of the area to do something else. This prevents unnecessary electrocution on anybody coming to see your work when you’re not around.
You can also cordon off the area entirely especially if you’re going to be
leaving the AC circuit on all through the night.
The AC Line
The AC line is the next aspect you need to master very well. It refers to a very complex electrical environment. You need to know what the environment actually looks like before you can carry out any design in it. In the first place, you have to discover what the voltage of the AC line is. This usually varies according to continents and government regulations. In the US for instance, the acceptable voltage is 120 VAC. There’s also 208 VAC allowed in US homes for dishwashers and other equipments. 480 VAC is used for industrial settings. In the rest of the continents, 240 VAC is allowed. In the US, 277 VAC is used to power fluorescent ballast fixtures. This is usually vital when designing LED replacements for such kind of light sources. In any case, it’s advisable that your LED circuit should be able to survive any voltage line that ranges from 0 – 135 VAC. It should be able to work within this range and not outside the range.
It’s important to note that you’re covered in the US market when you design your LED within the range of 0 – 135 VAC. However, for the rest of the world, you can use the 240 VAC to 265 VAC range. You should also know that incandescent light bulbs are meant to suit specific countries. You may need to consider this before you launch any design for different countries. You may try using the universal 120 VAC and 240 VAC to run the design.
In all, the practical AC Drive Circuitry for LEDs can be very complicated. There’s a need to be safety conscious when you’re working with the AC line.
The AC Line
The AC line is the next aspect you need to master very well. It refers to a very complex electrical environment. You need to know what the environment actually looks like before you can carry out any design in it. In the first place, you have to discover what the voltage of the AC line is. This usually varies according to continents and government regulations. In the US for instance, the acceptable voltage is 120 VAC. There’s also 208 VAC allowed in US homes for dishwashers and other equipments. 480 VAC is used for industrial settings. In the rest of the continents, 240 VAC is allowed. In the US, 277 VAC is used to power fluorescent ballast fixtures. This is usually vital when designing LED replacements for such kind of light sources. In any case, it’s advisable that your LED circuit should be able to survive any voltage line that ranges from 0 – 135 VAC. It should be able to work within this range and not outside the range.
It’s important to note that you’re covered in the US market when you design your LED within the range of 0 – 135 VAC. However, for the rest of the world, you can use the 240 VAC to 265 VAC range. You should also know that incandescent light bulbs are meant to suit specific countries. You may need to consider this before you launch any design for different countries. You may try using the universal 120 VAC and 240 VAC to run the design.
In all, the practical AC Drive Circuitry for LEDs can be very complicated. There’s a need to be safety conscious when you’re working with the AC line.
Utah Physicists Invent ‘Spintronic’ LED
University
of Utah physicists invented a new “spintronic” organic light-emitting diode or
OLED that promises to be brighter, cheaper and more environmentally friendly
than the kinds of LEDs now used in television and computer displays, lighting,
traffic lights and numerous electronic devices.
A new “spintronic” organic
light-emitting diode glows orangish (center) when the device, chilled well below
freezing, is exposed to a magnetic field from the two poles of an electromagnet
located on either side of the device. University of Utah physicists report
inventing the new kind of LED in the July 13 issue of the journal Science (Photo
Credit: Tho Nguyen, University of Utah)
“It’s a completely different technology,” says Z. Valy Vardeny, University of
Utah distinguished professor of physics and senior author of a study of the new
OLEDs in the July 13, 2012 issue of the journal Science. “These new organic LEDs
can be brighter than regular organic LEDs.”
The Utah physicists made a prototype of the new kind of LED – known technically as a spin-polarized organic LED or spin OLED – that produces an orange color. But Vardeny expects it will be possible within two years to use the new technology to produce red and blue as well, and he eventually expects to make white spin OLEDs.
However, it could be five years before the new LEDs hit the market because right now, they operate at temperatures no warmer than about minus 28 degrees Fahrenheit, and must be improved so they can run at room temperature, Vardeny adds.
Vardeny developed the new kind of LED with Tho D. Nguyen, a research assistant professor of physics and first author of the study, and Eitan Ehrenfreund, a physicist at the Technion-Israel Institute of Technology in Haifa.
The study was funded by the U.S. National Science Foundation, the U.S. Department of Energy, the Israel Science Foundation and U.S.-Israel Binational Science Foundation. The research was part of the University of Utah’s new Materials Research Science and Engineering Center, funded by the National Science Foundation and the Utah Science Technology and Research initiative.
The Evolution of LEDs and OLEDs:
The original kind of LEDs, introduced in the early 1960s, used a conventional semiconductor to generate colored light. Newer organic LEDs or OLEDs – with an organic polymer or “plastic” semiconductor to generate light – have become increasingly common in the last decade, particularly for displays in MP3 music players, cellular phones and digital cameras. OLEDs also are expected to be used increasingly for room lighting. Big-screen TVs with existing OLEDs will hit the market later this year.
The new kind of OLED invented by the Utah physicists also uses an organic semiconductor, but isn’t simply an electronic device that stores information based on the electrical charges of electrons. Instead, it is a “spintronic” device – meaning information also is stored using the “spins” of the electrons.
Invention of the new spin OLED was made possible by another device – an “organic spin valve” – the invention of which Vardeny and colleagues reported in the journal Nature in 2004. The original spin-valve device could only regulate electrical current flow, but the researchers expected they eventually could modify it to also emit light, making the new organic spin valve a spin OLED.
Organic spin valves are comprised of three layers: an organic layer that acts as a semiconductor and is sandwiched between two metal electrodes that are ferromagnets. In the new spin OLED, one of the ferromagnet metal electrodes is made of cobalt and the other one is made of a compound called lanthanum strontium manganese oxide. The organic layer in the new OLED is a polymer known as deuterated-DOO-PPV, which is a semiconductor that emits orange-colored light.
The whole device is 300 microns wide and long – or the width of three to six human hairs – and a mere 40 nanometers thick, which is roughly 1,000 to 2,000 times thinner than a human hair.
A low voltage is used to inject negatively charged electrons and positively charged “electron holes” through the organic semiconductor. When a magnetic field is applied to the electrodes, the spins of the electrons and electron holes in the organic semiconductor can be manipulated to align either parallel or antiparallel.
Two Advances Make New Kind of Organic LEDs Possible:
In the new study, the physicists report two crucial advances in the materials used to create “bipolar” organic spin valves that allow the new spin OLED to generate light, rather than just regulate electrical current. Previous organic spin valves could only adjust the flow of electrical current through the valves.
The first big advance was the use deuterium instead of normal hydrogen in the organic layer of the spin valve. Deuterium is “heavy hydrogen” or a hydrogen atom with a neutron added to regular hydrogen’s proton and electron. Vardeny says the use of deuterium made the production of light by the new spin OLED more efficient.
The second advance was the use of an extremely thin layer of lithium fluoride deposited on the cobalt electrode. This layer allows negatively charged electrons to be injected through one side of the spin valve at the same time as positively charged electron holes are injected through the opposite side. That makes the spin valve “bipolar,” unlike older spin valves, into which only holes could be injected.
It is the ability to inject electrons and holes at the same time that allows light to be generated. When an electron combines with a hole, the two cancel each other out and energy is released in the form of light.
“When they meet each other, they form ‘excitons,’ and these excitons give you light,” Vardeny says.
By injecting electrons and holes into the device, it supports more current and has the ability to emit light, he says, adding that the intensity of the new spintronic OLEDs can be a controlled with a magnetic field, while older kinds require more electrical current to boost light intensity.
Existing OLEDs each produce a particular color of light – such as red, green and blue – based on the semiconductor used. Vardeny says the beauty of the new spin OLEDs is that, in the future, a single device may produce different colors when controlled by changes in magnetic field.
He also says devices using organic semiconductors are generally less expensive and are manufactured with less toxic waste than conventional silicon semiconductors.
The Utah physicists made a prototype of the new kind of LED – known technically as a spin-polarized organic LED or spin OLED – that produces an orange color. But Vardeny expects it will be possible within two years to use the new technology to produce red and blue as well, and he eventually expects to make white spin OLEDs.
However, it could be five years before the new LEDs hit the market because right now, they operate at temperatures no warmer than about minus 28 degrees Fahrenheit, and must be improved so they can run at room temperature, Vardeny adds.
Vardeny developed the new kind of LED with Tho D. Nguyen, a research assistant professor of physics and first author of the study, and Eitan Ehrenfreund, a physicist at the Technion-Israel Institute of Technology in Haifa.
The study was funded by the U.S. National Science Foundation, the U.S. Department of Energy, the Israel Science Foundation and U.S.-Israel Binational Science Foundation. The research was part of the University of Utah’s new Materials Research Science and Engineering Center, funded by the National Science Foundation and the Utah Science Technology and Research initiative.
The Evolution of LEDs and OLEDs:
The original kind of LEDs, introduced in the early 1960s, used a conventional semiconductor to generate colored light. Newer organic LEDs or OLEDs – with an organic polymer or “plastic” semiconductor to generate light – have become increasingly common in the last decade, particularly for displays in MP3 music players, cellular phones and digital cameras. OLEDs also are expected to be used increasingly for room lighting. Big-screen TVs with existing OLEDs will hit the market later this year.
The new kind of OLED invented by the Utah physicists also uses an organic semiconductor, but isn’t simply an electronic device that stores information based on the electrical charges of electrons. Instead, it is a “spintronic” device – meaning information also is stored using the “spins” of the electrons.
Invention of the new spin OLED was made possible by another device – an “organic spin valve” – the invention of which Vardeny and colleagues reported in the journal Nature in 2004. The original spin-valve device could only regulate electrical current flow, but the researchers expected they eventually could modify it to also emit light, making the new organic spin valve a spin OLED.
“It took us eight years to accomplish this feat,” Vardeny
says.
Spin valves are electrical switches used in computers, TVs, cell phones and
many other electrical devices. They are so named because they use a property of
electrons called “spin” to transmit information. Spin is defined as the
intrinsic angular momentum of a particle. Electron spins can have one of two
possible directions, up or down. Up and down can correlate to the zeroes and
ones in binary code.Organic spin valves are comprised of three layers: an organic layer that acts as a semiconductor and is sandwiched between two metal electrodes that are ferromagnets. In the new spin OLED, one of the ferromagnet metal electrodes is made of cobalt and the other one is made of a compound called lanthanum strontium manganese oxide. The organic layer in the new OLED is a polymer known as deuterated-DOO-PPV, which is a semiconductor that emits orange-colored light.
The whole device is 300 microns wide and long – or the width of three to six human hairs – and a mere 40 nanometers thick, which is roughly 1,000 to 2,000 times thinner than a human hair.
A low voltage is used to inject negatively charged electrons and positively charged “electron holes” through the organic semiconductor. When a magnetic field is applied to the electrodes, the spins of the electrons and electron holes in the organic semiconductor can be manipulated to align either parallel or antiparallel.
Two Advances Make New Kind of Organic LEDs Possible:
In the new study, the physicists report two crucial advances in the materials used to create “bipolar” organic spin valves that allow the new spin OLED to generate light, rather than just regulate electrical current. Previous organic spin valves could only adjust the flow of electrical current through the valves.
The first big advance was the use deuterium instead of normal hydrogen in the organic layer of the spin valve. Deuterium is “heavy hydrogen” or a hydrogen atom with a neutron added to regular hydrogen’s proton and electron. Vardeny says the use of deuterium made the production of light by the new spin OLED more efficient.
The second advance was the use of an extremely thin layer of lithium fluoride deposited on the cobalt electrode. This layer allows negatively charged electrons to be injected through one side of the spin valve at the same time as positively charged electron holes are injected through the opposite side. That makes the spin valve “bipolar,” unlike older spin valves, into which only holes could be injected.
It is the ability to inject electrons and holes at the same time that allows light to be generated. When an electron combines with a hole, the two cancel each other out and energy is released in the form of light.
“When they meet each other, they form ‘excitons,’ and these excitons give you light,” Vardeny says.
By injecting electrons and holes into the device, it supports more current and has the ability to emit light, he says, adding that the intensity of the new spintronic OLEDs can be a controlled with a magnetic field, while older kinds require more electrical current to boost light intensity.
Existing OLEDs each produce a particular color of light – such as red, green and blue – based on the semiconductor used. Vardeny says the beauty of the new spin OLEDs is that, in the future, a single device may produce different colors when controlled by changes in magnetic field.
He also says devices using organic semiconductors are generally less expensive and are manufactured with less toxic waste than conventional silicon semiconductors.
Monday, 30 July 2012
Germany Trade & Invest Focuses on LED Market
Aiming at an expected double digit annual growth through 2018 for
German LED lighting industry, Germany Trade & Invest has announced to center on LED
technologies.
Germany Trade & Invest experts, who will be at this year‘s LED/OLED Expo in South Korea from June 26 until June 29, have said that LED and OLED companies are well positioned for the next growth phase within the lighting industry.
Jonathan Schoo, electronics and microtechnology expert at Germany Trade & Invest in Berlin, pointed out that, "The energy revolution in Germany is enabling many infrastructural upgrades. Several German cities have already begun testing LEDs in street lamps and in buildings. The German automobile industry is also exploring the advantages of LEDs, which could draw in valuable investments."
According to Frost & Sullivan, a market research company, the LED lamp industry in Germany is expected to produce a compound annual growth rate of 27 percent between 2008 and 2018. Many municipalities in Germany see 50 percent of total energy costs being devoted to lighting. Newly installed LED fixtures have the potential to bring down energy used in street lighting by 80 percent.
"There is a call for foreign investment to support increasing LED installations. Germany provides an excellent infrastructure and a skilled workforce for international companies interested in taking advantage of the recent energy shift in the country," concluded Schoo.
Germany Trade & Invest experts, who will be at this year‘s LED/OLED Expo in South Korea from June 26 until June 29, have said that LED and OLED companies are well positioned for the next growth phase within the lighting industry.
Jonathan Schoo, electronics and microtechnology expert at Germany Trade & Invest in Berlin, pointed out that, "The energy revolution in Germany is enabling many infrastructural upgrades. Several German cities have already begun testing LEDs in street lamps and in buildings. The German automobile industry is also exploring the advantages of LEDs, which could draw in valuable investments."
According to Frost & Sullivan, a market research company, the LED lamp industry in Germany is expected to produce a compound annual growth rate of 27 percent between 2008 and 2018. Many municipalities in Germany see 50 percent of total energy costs being devoted to lighting. Newly installed LED fixtures have the potential to bring down energy used in street lighting by 80 percent.
"There is a call for foreign investment to support increasing LED installations. Germany provides an excellent infrastructure and a skilled workforce for international companies interested in taking advantage of the recent energy shift in the country," concluded Schoo.
http://www.elite-opto.com/tech/2012-7-20-17-5-1654.html
Lighting the Clean Revolution: The rise of LEDs and what it means for cities
LED (light-emitting diodes) are revolutionizing the energy efficiency of lighting. They are also infinitely
scalable, extremely reliable, and have a much longer lifetime than almost all
other types of lighting. But like any new technology, they face
barriers to adoption from a market unfamiliar with their benefits.
This report explores the global market status and potential for LED and smart control technology, and provides practical guidance for policy makers and lighting managers who want to scale up and finance large-scale LED retrofits.
We developed this guidance using the summarized results of LightSavers, a global program we established with the support of the HSBC Climate Partnership to accelerate market adoption of outdoor LED lighting and smart lighting controls.
The report demonstrates that LEDs are ready to be brought to scale in outdoor applications. The independent and verifiable results from the LightSavers trials and accompanying public surveys give compelling evidence that many commercially-available, outdoor LED products offer high quality light, durability, and significant electricity savings in the range of 50-70%.
http://www.elite-opto.com/tech/2012-7-20-17-7-3421.html
This report explores the global market status and potential for LED and smart control technology, and provides practical guidance for policy makers and lighting managers who want to scale up and finance large-scale LED retrofits.
We developed this guidance using the summarized results of LightSavers, a global program we established with the support of the HSBC Climate Partnership to accelerate market adoption of outdoor LED lighting and smart lighting controls.
The report demonstrates that LEDs are ready to be brought to scale in outdoor applications. The independent and verifiable results from the LightSavers trials and accompanying public surveys give compelling evidence that many commercially-available, outdoor LED products offer high quality light, durability, and significant electricity savings in the range of 50-70%.
http://www.elite-opto.com/tech/2012-7-20-17-7-3421.html
Monday, 23 July 2012
Cree targets luminaire system cost with new XLamp XB-D LED
11 Jan 2012
| ||||
With the small-footprint XB-D LED, intends to lower the cost, in terms of lumens per dollar, for SSL and luminaire designs.
| ||||
has announced the new XLamp XB-D LED family that features components measuring 2.45x2.45 mm, that the company says will deliver double the lumens per dollar achievable at the system level. The small footprint will be especially suited to solid-state (SSL) retrofit s, although has said that the built with a new die structure will serve across a broad application base.
At 350-mA drive current and 85°C operating temperature, the new LED platform delivers 139 lm in 6000K-CCT, cool-white models, and 107 lm in 3000K-CCT, warm-white models. The efficacy is 136 and 105 lm/W respectively.
The feature a maximum drive current of 1A. The cool-white components can be specified with no minimum CRI value or optionally with a 70 CRI minimum. Neutral-white products feature a typical CRI value of 75 and can be specified at 80 CRI minimum. The warm-white LEDS feature a typical CRI of 80 and can also be specified at a minimum value of 80.
Hot binning across CCT range
There are several other notable features of the new family according to product marketing manager Paul Scheidt. He said that the XB-D is the first LED family to be hot-binned across all CCTs. Scheidt said, "Competitors only hot bin in the warm-white CCTs."
The new platform includes several elements that says will help reduce system cost. Obviously the smaller die has a direct impact on component cost because can manufacture more components per wafer. did not directly address component cost. But the company did show a table that indicates the XB-D delivers more lumens and better efficacy than competing components that measure 3.5x3.5 mm and larger.
In part the performance comes from a new die architecture and packaging scheme, along with what says are inherent advantages in its manufacturing process, a claim we will discuss a bit later. A photo of an XB-D LED with no phosphor applied revealed a beveled structure around the die designed to maximize light extraction.
Flexible design
The smaller component footprint also provides designers of retrofit s far more flexibility in design and the ability to include more in smaller spaces. For example, Scheidt showed an example of a standard A Lamp where the can be placed deeper in the neck of the rather than at the equator of the globe, thereby providing better light distribution.
Scheidt also said that the small size simplifies the design of other elements such as secondary optics and reflectors. The same holds true for circuit boards. All of those simpler elements add to the potential for a lower system cost.
believes the XB-D can increase the penetration of s in price-sensitive markets such as the residential space. Scheidt cited a Home Depot study in which the same s were sold for $20 in some select stores and for $10 in other select stores. According to Scheidt, the stores with the lower-priced s realized 6 to 10 times the sales volume.
About SSL s, Scheidt said, "The product itself is there in terms of technology. People accept it." He was speaking of aspects such as color and light quality while noting that cost remains the obstacle. But addressing current price levels, he added, "We‘re at least in the right order of magnitude." And presumably XB-D will help relieve another significant reduction.
Silicon-carbide manufacturing
also took the occasion of the XB-D launch to emphasize what it belies is a competitive advantage of its gallium-nitride (GaN) on silicon-carbide (SiC) manufacturing process. ‘s Scheidt said that the SiC substrate offers numerous advantages over the sapphire substrates widely used by competitors.
Like many manufacturers of -class , uses a flip-chip approach in which the substrate side of the die is on the top side of the packaged LED. Scheidt said SiC offers a refractive index that better matches the GaN layers than does sapphire, thereby improving light extraction.
Scheidt further said that SiC offers a better match in terms of coefficient of thermal expansion resulting in fewer cracks. And that SiC results in smaller lattice-structure mismatches between the GaN and SiC layers thereby yielding more efficient .
|
Cree targets luminaire system cost with new XLamp XB-D LED
11 Jan 2012
| ||||
With the small-footprint XB-D LED, intends to lower the cost, in terms of lumens per dollar, for SSL and luminaire designs.
| ||||
has announced the new XLamp XB-D LED family that features components measuring 2.45x2.45 mm, that the company says will deliver double the lumens per dollar achievable at the system level. The small footprint will be especially suited to solid-state (SSL) retrofit s, although has said that the built with a new die structure will serve across a broad application base.
At 350-mA drive current and 85°C operating temperature, the new LED platform delivers 139 lm in 6000K-CCT, cool-white models, and 107 lm in 3000K-CCT, warm-white models. The efficacy is 136 and 105 lm/W respectively.
The feature a maximum drive current of 1A. The cool-white components can be specified with no minimum CRI value or optionally with a 70 CRI minimum. Neutral-white products feature a typical CRI value of 75 and can be specified at 80 CRI minimum. The warm-white LEDS feature a typical CRI of 80 and can also be specified at a minimum value of 80.
Hot binning across CCT range
There are several other notable features of the new family according to product marketing manager Paul Scheidt. He said that the XB-D is the first LED family to be hot-binned across all CCTs. Scheidt said, "Competitors only hot bin in the warm-white CCTs."
The new platform includes several elements that says will help reduce system cost. Obviously the smaller die has a direct impact on component cost because can manufacture more components per wafer. did not directly address component cost. But the company did show a table that indicates the XB-D delivers more lumens and better efficacy than competing components that measure 3.5x3.5 mm and larger.
In part the performance comes from a new die architecture and packaging scheme, along with what says are inherent advantages in its manufacturing process, a claim we will discuss a bit later. A photo of an XB-D LED with no phosphor applied revealed a beveled structure around the die designed to maximize light extraction.
Flexible design
The smaller component footprint also provides designers of retrofit s far more flexibility in design and the ability to include more in smaller spaces. For example, Scheidt showed an example of a standard A Lamp where the can be placed deeper in the neck of the rather than at the equator of the globe, thereby providing better light distribution.
Scheidt also said that the small size simplifies the design of other elements such as secondary optics and reflectors. The same holds true for circuit boards. All of those simpler elements add to the potential for a lower system cost.
believes the XB-D can increase the penetration of s in price-sensitive markets such as the residential space. Scheidt cited a Home Depot study in which the same s were sold for $20 in some select stores and for $10 in other select stores. According to Scheidt, the stores with the lower-priced s realized 6 to 10 times the sales volume.
About SSL s, Scheidt said, "The product itself is there in terms of technology. People accept it." He was speaking of aspects such as color and light quality while noting that cost remains the obstacle. But addressing current price levels, he added, "We‘re at least in the right order of magnitude." And presumably XB-D will help relieve another significant reduction.
Silicon-carbide manufacturing
also took the occasion of the XB-D launch to emphasize what it belies is a competitive advantage of its gallium-nitride (GaN) on silicon-carbide (SiC) manufacturing process. ‘s Scheidt said that the SiC substrate offers numerous advantages over the sapphire substrates widely used by competitors.
Like many manufacturers of -class , uses a flip-chip approach in which the substrate side of the die is on the top side of the packaged LED. Scheidt said SiC offers a refractive index that better matches the GaN layers than does sapphire, thereby improving light extraction.
Scheidt further said that SiC offers a better match in terms of coefficient of thermal expansion resulting in fewer cracks. And that SiC results in smaller lattice-structure mismatches between the GaN and SiC layers thereby yielding more efficient .
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