GE Lighting has announced an led street light wholesale project with the city of Phoenix, AZ that will include conversion of 700 high-pressure sodium (HPS) lights to LEDs this year. The city is projecting 60% energy savings from the retrofit and plans to convert all 95,000 legacy fixtures in the city by 2020.
Ironically, the Illuminating Engineering Society (IES) Street and Area Lighting Conference (SALC) was held at a Phoenix resort in September 2013. At the conference opening, speakers from the city of Phoenix admitted that the city had yet to begin installing LED street lights , although the city had lit the short roadway to the resort entrance that hosted the event with LEDs just prior to the conference.
Indeed, Phoenix went through an unusually long test and evaluation period before choosing a street-light retrofit course of action. "We reviewed more than two dozen fixtures and conducted controlled testing for nearly four years to examine characteristics such as lighting patterns, overspill, and uplighting, "said Jason Fernandez, principal engineer technician with the Phoenix Street Transportation Department.
The city worked with the Arizona Public Services (APS) utility on the project. APS led the field test portion of the project including installation and evaluation of five GE Evolve luminaires including ERS1 and ERS2 models. The city was especially concerned about the harsh operating environment and the fact that temperature extremes range to 105 ° F.
The evaluation led to GE being selected to supply fixtures for the broader project. "GE's Evolve LED street lighting is our new standard and will be installed anywhere a fixture needs to be replaced or where new construction and capital improvements occur," Fernandez said. "Additionally, with the energy and cost savings we experience from each new fixture, we're putting that money toward our investment for more LED street lights. "
Specifically, the city is installing the GE Evolve LED Roadway Scalable Cobrahead fixtures. The scalable design is achieved via the number of LED light engines used to populate a fixture and results in the same basic design being applicable to a wide variety of roadway types. Oakland , CA recently announced plans to use the scalable family as well.
Phoenix is planning to convert 700 fixtures this year wth the upgrade already underway. led street lighting fixture will deliver $ 57,000 annually in energy savings and $ 41,000 annually in maintenance savings. The city projects 11 years of maintenance-free usage based on 12-hour days and the 50,000-hour expected lifetime.
Ultimately, Phoenix plans to install LED lighting along 4800 miles of roadway by 2020. The project will encompass 95,000 LED fixtures.
more info you can visit:http://www.lead-lighting.com/products/sid108-1.htm
2014年8月4日星期一
A Canadian company is lighting up the roadways of the world
If you get homesick during your next visit to Adelaide or Reykjavik or Aruba, just look up, way up led street lighting Manufacturer has installed energy-efficient street lights in nearly 40 countries -. And most of them are manufactured at its plant in Amherst, Nova Scotia.
. The plant has the look of a high-tech laboratory Its 150 employees wear blue smocks and special shoes that are grounded to prevent electrostatic discharges that could damage the lights' delicate components (which include computer chips) The old assembly line is gone.; the factory recently switched to so-called cellular production, which means LRL's fabricators now assemble the lights at a series of small workstations-all the better to deliver the various product iterations demanded by its global clients.
Disoriented airport travellers might soon be able to look to the floor to help them navigate their way to their departure gate. Two Dutch companies have collaborated to produce what they call a 'magic carpet', fitted with LED lights designed to guide pedestrians on their way . Jim Drury reports.
Founder and CEO Charles Cartmill-everyone around here calls him Chuck-has big plans for this place. If he has his way, the orange glow of high-pressure sodium lights that line most of the world's streets will be a distant memory. Not only power-hungry, those orange orbs also contain dangerous metals like mercury or lead Switching them over to LED has massive potential:. There are an estimated 280 million street lights in the world And though the upfront cost of LED bulbs is higher, so are. the electricity savings-60 per cent. Plus, maintenance costs are far lower (LRL's latest version boasts a 20-year, maintenance-free life cycle, in contrast to conventional sodium lights, which require changing after five years).
Cartmill started out in 1974, travelling across the four Atlantic provinces selling lighting for clients like Philips It was not until 2002 that he bought the 55,000-square-foot facility in Amherst His plan:.. Well, he did not have one. As Cartmill admits: "I bought an empty building No government money No customers No employees...."
It was not empty for long. Cartmill became a manufacturer for hire, serving various electronics companies, who would send him orders for a wide range of components. Industry insiders had their doubts about whether Cartmill understood what he was up against. One asked him point blank, "What the hell do you know about contract manufacturing, anyway?" Cartmill paused and replied, "I know how to bring the business in the door. That's a good place to start. I'll figure out the rest."
One of his early jobs was making led street light wholesale was hooked;. His ultimate goal was to start designing his own version-but not until the bulbs were efficient enough to power street lights Unlike almost every other type of illumination, street lights aren. 't sold through distributors; Cartmill figured that if he could talk directly with municipalities and utility companies, he'd be able to compete with major players like General Electric and his old client, Philips.
By late 2006, LED technology was finally ready for the spotlight, and LRL had its first fixtures on poles two years later, thanks to an initial $ 2.1-million loan from the Atlantic Innovation Fund. The following year, LRL received another $ 3-million cash infusion, all of which was plowed into R & D It has paid off:. Over the past three years, LRL has averaged a 48 per cent revenue increase year-over-year.
Cartmill, 66, has racked up a slew of frequent flier miles in that time, travelling to Mexico, the Middle East, the Caribbean, Central America and the UK to broker deals. During his first trade mission to Brazil, he insisted on taking his bulky LED lights-grey cast aluminum fixtures roughly two feet by one that weigh more than eight kilograms-to every function, including a breakfast meeting Local officials gently chided him, but his tenacity paid off:. LRL is now in the middle of a bidding to replace all of S ?? o Paulo's street lights.
To an outsider, designing street lights might appear to be no more complicated than building an oversized, waterproof floor lamp But as Ken Kovachik, LRL's director of marketing, puts it:. "You want to be able to deliver the most amount of light, to the right place, using the least amount of energy. "But existing lighting systems, even within Canada, have different voltage requirements. Add in country-specific certifications and regulations, plus variations in testing and wiring, not to mention a multitude of brightness and colour options, and things get complicated fast.
All these variables help explain the need for heavy R & D spending. LRL's latest innovation is a modular system. Inside the light's housing, known in the industry as the "tin can," is an LED light engine-a collection of lamps attached to a circuit board. Then there's the power supply (the "driver") and thermal management system. Going modular means that if LED efficiency improves considerably-and Kovachik says it's just a matter of time-LRL's fixtures can be upgraded in less than 60 seconds.
Manufacturing in Canada can be expensive, but Cartmill describes his Amherst workforce as "competitively priced." And, as Kovachik notes, "In markets like the Caribbean, Canada has a very high profile for quality products and engineering." But given the expense involved in shipping metal casings halfway around the world-not to mention the time it takes, along with high tariffs in certain markets-LRL now has manufacturing capabilities in Wales and Brazil, and is setting up in Australia. The only roadblock to success has been the 2009 US stimulus bill and its "Buy American" clause.
Still, the future for LRL looks, well, bright. Canada alone has four million street lights, and municipalities that switch to LED typically enjoy average energy savings of 60 per cent. Edmonton, for instance, recently installed 18,000 new LED street lights (from LRL, of course), a move that is expected to save the city $ 18-million over 20 years.
And LEDs are just the beginning. The next innovation involves embedding wireless controls, networked to allow for geographic-specific dimming schedules and improved monitoring. In 2011, to bolster the LRL's capabilities in this area, Cartmill bought Streetlight Intelligence, a Vancouver-based company that had gone into receivership. A year ago, lighting controls represented 2 per cent or 3 per cent of prospective LRL clients. Now, it's closer to 50 per cent. Which means that soon, no smart city will be without an LED night light.
more info you can visit:http://www.lead-lighting.com/products/sid107-1.htm
. The plant has the look of a high-tech laboratory Its 150 employees wear blue smocks and special shoes that are grounded to prevent electrostatic discharges that could damage the lights' delicate components (which include computer chips) The old assembly line is gone.; the factory recently switched to so-called cellular production, which means LRL's fabricators now assemble the lights at a series of small workstations-all the better to deliver the various product iterations demanded by its global clients.
Disoriented airport travellers might soon be able to look to the floor to help them navigate their way to their departure gate. Two Dutch companies have collaborated to produce what they call a 'magic carpet', fitted with LED lights designed to guide pedestrians on their way . Jim Drury reports.
Founder and CEO Charles Cartmill-everyone around here calls him Chuck-has big plans for this place. If he has his way, the orange glow of high-pressure sodium lights that line most of the world's streets will be a distant memory. Not only power-hungry, those orange orbs also contain dangerous metals like mercury or lead Switching them over to LED has massive potential:. There are an estimated 280 million street lights in the world And though the upfront cost of LED bulbs is higher, so are. the electricity savings-60 per cent. Plus, maintenance costs are far lower (LRL's latest version boasts a 20-year, maintenance-free life cycle, in contrast to conventional sodium lights, which require changing after five years).
Cartmill started out in 1974, travelling across the four Atlantic provinces selling lighting for clients like Philips It was not until 2002 that he bought the 55,000-square-foot facility in Amherst His plan:.. Well, he did not have one. As Cartmill admits: "I bought an empty building No government money No customers No employees...."
It was not empty for long. Cartmill became a manufacturer for hire, serving various electronics companies, who would send him orders for a wide range of components. Industry insiders had their doubts about whether Cartmill understood what he was up against. One asked him point blank, "What the hell do you know about contract manufacturing, anyway?" Cartmill paused and replied, "I know how to bring the business in the door. That's a good place to start. I'll figure out the rest."
One of his early jobs was making led street light wholesale was hooked;. His ultimate goal was to start designing his own version-but not until the bulbs were efficient enough to power street lights Unlike almost every other type of illumination, street lights aren. 't sold through distributors; Cartmill figured that if he could talk directly with municipalities and utility companies, he'd be able to compete with major players like General Electric and his old client, Philips.
By late 2006, LED technology was finally ready for the spotlight, and LRL had its first fixtures on poles two years later, thanks to an initial $ 2.1-million loan from the Atlantic Innovation Fund. The following year, LRL received another $ 3-million cash infusion, all of which was plowed into R & D It has paid off:. Over the past three years, LRL has averaged a 48 per cent revenue increase year-over-year.
Cartmill, 66, has racked up a slew of frequent flier miles in that time, travelling to Mexico, the Middle East, the Caribbean, Central America and the UK to broker deals. During his first trade mission to Brazil, he insisted on taking his bulky LED lights-grey cast aluminum fixtures roughly two feet by one that weigh more than eight kilograms-to every function, including a breakfast meeting Local officials gently chided him, but his tenacity paid off:. LRL is now in the middle of a bidding to replace all of S ?? o Paulo's street lights.
To an outsider, designing street lights might appear to be no more complicated than building an oversized, waterproof floor lamp But as Ken Kovachik, LRL's director of marketing, puts it:. "You want to be able to deliver the most amount of light, to the right place, using the least amount of energy. "But existing lighting systems, even within Canada, have different voltage requirements. Add in country-specific certifications and regulations, plus variations in testing and wiring, not to mention a multitude of brightness and colour options, and things get complicated fast.
All these variables help explain the need for heavy R & D spending. LRL's latest innovation is a modular system. Inside the light's housing, known in the industry as the "tin can," is an LED light engine-a collection of lamps attached to a circuit board. Then there's the power supply (the "driver") and thermal management system. Going modular means that if LED efficiency improves considerably-and Kovachik says it's just a matter of time-LRL's fixtures can be upgraded in less than 60 seconds.
Manufacturing in Canada can be expensive, but Cartmill describes his Amherst workforce as "competitively priced." And, as Kovachik notes, "In markets like the Caribbean, Canada has a very high profile for quality products and engineering." But given the expense involved in shipping metal casings halfway around the world-not to mention the time it takes, along with high tariffs in certain markets-LRL now has manufacturing capabilities in Wales and Brazil, and is setting up in Australia. The only roadblock to success has been the 2009 US stimulus bill and its "Buy American" clause.
Still, the future for LRL looks, well, bright. Canada alone has four million street lights, and municipalities that switch to LED typically enjoy average energy savings of 60 per cent. Edmonton, for instance, recently installed 18,000 new LED street lights (from LRL, of course), a move that is expected to save the city $ 18-million over 20 years.
And LEDs are just the beginning. The next innovation involves embedding wireless controls, networked to allow for geographic-specific dimming schedules and improved monitoring. In 2011, to bolster the LRL's capabilities in this area, Cartmill bought Streetlight Intelligence, a Vancouver-based company that had gone into receivership. A year ago, lighting controls represented 2 per cent or 3 per cent of prospective LRL clients. Now, it's closer to 50 per cent. Which means that soon, no smart city will be without an LED night light.
more info you can visit:http://www.lead-lighting.com/products/sid107-1.htm
China's colossal LED makers are making forays into Korean market
China's gigantic LED companies are descending on Korea. Considering that the LED lighting is relatively more expensive in Korea, they are making inroads into the Korean market with super-low-priced products. The domestic led high bay light for sale companies are tensed up.
According to industry insiders on July 27, recently MLS, a Chinese LED maker, began to sell lighting products through the exclusive distributor in Korea called 'optoleds.' MLS is not well-known in Korea, but holds an unchallenged position in China. This company became the first Chinese company to be included in the top 10 companies in the global LED market. If it maintains the current growth trend, some forecast that it will catch up with Japan's Nichia, ranked No. 1 in the industry, in a few years.
About 87% of MLS 'total sales come from LED package products. Most of them are lighting products. The company is already No. 1 in the world when it comes to LED package production. Last year its monthly production quantity was 13.45 billion, and it is expected to reach 20 billion this year. Its sales target for this year is double that of last year, ie RMB6 billion (about KRW1 trillion).
MLS 'biggest competitiveness is the reduced manufacturing cost through large-scale production. The company internalized the adhesive used to bond the lead frame (L / F), ie the metal substrate that raises the semiconductor chip for bonding, and the chip. So, it can reduce production costs. Also, it can capitalize on large demands to purchase LED chips at a low price.
Back in 2012, MLS released an LED light bulb at $ 1 for the first time in the world. It can be said to be similar to 'Xiaomi' that is growing fast in the Chinese market with a low-priced smartphone strategy.
'KINGSUN,' competing with MLS for leadership in the Chinese LED lighting market, also entered the Korean market through a domestic partner 'Digisys.' This company recently entered into an agreement worth $ 10 million with the Eland Group, and supplied its products to the NC Department Store and Newcore Outlet. The company is investigated as some of its products are suspected of violating KC certification, but it is still aggressive in the Korean market.
The domestic lighting industry is extremely alarmed because of Chinese companies' invasion of the Korean market. The consensus is that a 'chicken game' based on price competition is close at hand. Accordingly, some companies are busy coming up with countermeasures, eg lowering the prices of existing LED lighting products or using a premium strategy.
"As the Chinese government picked cree xsp series led street light as an item it will intensively develop in the future, it is actively supporting related companies," said industry experts. "We must also urgently find ways to enhance the competitiveness of the LED industry at the national level . "
more info you can visit:http://www.lead-lighting.com/products/sid109-1.htm
According to industry insiders on July 27, recently MLS, a Chinese LED maker, began to sell lighting products through the exclusive distributor in Korea called 'optoleds.' MLS is not well-known in Korea, but holds an unchallenged position in China. This company became the first Chinese company to be included in the top 10 companies in the global LED market. If it maintains the current growth trend, some forecast that it will catch up with Japan's Nichia, ranked No. 1 in the industry, in a few years.
About 87% of MLS 'total sales come from LED package products. Most of them are lighting products. The company is already No. 1 in the world when it comes to LED package production. Last year its monthly production quantity was 13.45 billion, and it is expected to reach 20 billion this year. Its sales target for this year is double that of last year, ie RMB6 billion (about KRW1 trillion).
MLS 'biggest competitiveness is the reduced manufacturing cost through large-scale production. The company internalized the adhesive used to bond the lead frame (L / F), ie the metal substrate that raises the semiconductor chip for bonding, and the chip. So, it can reduce production costs. Also, it can capitalize on large demands to purchase LED chips at a low price.
Back in 2012, MLS released an LED light bulb at $ 1 for the first time in the world. It can be said to be similar to 'Xiaomi' that is growing fast in the Chinese market with a low-priced smartphone strategy.
'KINGSUN,' competing with MLS for leadership in the Chinese LED lighting market, also entered the Korean market through a domestic partner 'Digisys.' This company recently entered into an agreement worth $ 10 million with the Eland Group, and supplied its products to the NC Department Store and Newcore Outlet. The company is investigated as some of its products are suspected of violating KC certification, but it is still aggressive in the Korean market.
The domestic lighting industry is extremely alarmed because of Chinese companies' invasion of the Korean market. The consensus is that a 'chicken game' based on price competition is close at hand. Accordingly, some companies are busy coming up with countermeasures, eg lowering the prices of existing LED lighting products or using a premium strategy.
"As the Chinese government picked cree xsp series led street light as an item it will intensively develop in the future, it is actively supporting related companies," said industry experts. "We must also urgently find ways to enhance the competitiveness of the LED industry at the national level . "
more info you can visit:http://www.lead-lighting.com/products/sid109-1.htm
600 Group takes a 26% stake in global laser business
West Yorkshire's 600 Group has acquired shares representing 26.3% of the issued share capital of ProPhotonix, the laser and LED specialist.
The consideration for the purchase of these shares will be satisfied by the issue of 4,925,621 ordinary shares of 1p each in the company ("New Ordinary Shares") representing 5.5% of the issued share capital of the 600 Group.
ProPhotonix is based in Salem, New Hampshire, USA and consists of two businesses which manufacture LED panel lighting wholesale in Cork, Ireland and produce and distribute laser modules and diodes from Hatfield Broad Oak in the UK. In the year to December 2013, Prophotonix reported operating losses of US $ 1.18 million on annual revenues of US $ 15.60 million.
600 Group Plc will become the largest shareholder in Prophotonix, and will seek to work constructively with the board of ProPhotonix to explore possible closer business co-operation in future.
led street lighting fixture will be made for the New Ordinary Shares to be admitted to trading on AIM. The New Ordinary Shares will rank pari passu in all respects with the existing ordinary shares.
Following admission of the New Ordinary Shares, the Company's issued share capital will consist of 89,607,958 ordinary shares with voting rights. 600 Group does not hold any ordinary shares in treasury.
600 Group chairman, Paul Dupee, said: "This should be construed as a strategic investment in a company with interesting business activities and improving prospects."
more info you can visit:http://www.lead-lighting.com/products/sid108-1.htm
The consideration for the purchase of these shares will be satisfied by the issue of 4,925,621 ordinary shares of 1p each in the company ("New Ordinary Shares") representing 5.5% of the issued share capital of the 600 Group.
ProPhotonix is based in Salem, New Hampshire, USA and consists of two businesses which manufacture LED panel lighting wholesale in Cork, Ireland and produce and distribute laser modules and diodes from Hatfield Broad Oak in the UK. In the year to December 2013, Prophotonix reported operating losses of US $ 1.18 million on annual revenues of US $ 15.60 million.
600 Group Plc will become the largest shareholder in Prophotonix, and will seek to work constructively with the board of ProPhotonix to explore possible closer business co-operation in future.
led street lighting fixture will be made for the New Ordinary Shares to be admitted to trading on AIM. The New Ordinary Shares will rank pari passu in all respects with the existing ordinary shares.
Following admission of the New Ordinary Shares, the Company's issued share capital will consist of 89,607,958 ordinary shares with voting rights. 600 Group does not hold any ordinary shares in treasury.
600 Group chairman, Paul Dupee, said: "This should be construed as a strategic investment in a company with interesting business activities and improving prospects."
more info you can visit:http://www.lead-lighting.com/products/sid108-1.htm
LED advancements drive quality of light gains
Gallium nitride (GaN) LEDs based on sapphire and silicon-carbide substrates have advanced over the last 20 years but generally still fail to meet the light quality aspects we associate with natural lighting (daylight and incandescence). The shortcoming is partly due the led street light fixture Manufacturer focus on increasing luminosity at the expense of aspects such as color and whiteness rendering, beam pattern, and total light output. A different approach would be to develop high-efficiency LEDs and leverage the performance to provide the quality aspects of natural lighting. Let's discuss ways to characterize light quality and how it can be delivered by LEDs built on homogeneous substrates.
The latest GaN-on-GaN LEDs will afford the headroom from a performance perspective to allow a focus on better light. The third-generation devices exhibit peak wall-plug efficiency of 80% (at 85 ° C), and 65% at 150 A / cm2, a current density five (or more) times higher than for LEDs based on foreign substrates. The practical benefits of this recent performance leap are twofold. First, it enables a compelling LED-based solution in systems running at high temperature and high current densities, where conventional LED technology has struggled. And the headroom provided by increased efficiency can be spent on light quality.
Indeed, Quality of Light (QoL) must be considered as an essential property of light sources. QoL has many aspects, but perhaps the best known is color fidelity, measured by the color rendering index (CRI) Ra and the special index R9. The latter is important for deep reds but also, crucially, the tones of human skin. Most LED products aim moderately for Ra in the range of 80 and R9 above 0. This target is based on the often-held belief that such values are sufficient. On the other hand, higher-end options are also available with values as high as Ra = 95 and R9 = 95. Such higher color rendering requires photons at the ends of the spectrum (violet and deep red) and therefore comes at cost of efficiency . The superior efficiency of GaN-on-GaN technology will be crucial in supporting high CRI, as the efficiency headroom more than makes up for the penalties inherent at the high QoL levels.
Optical brightening agents
An equally important and often disregarded measure of light quality is whiteness rendering. While rendering of the color white may seem trivial, this is not the case due to the decades-old and near-ubiquitous use of optical brightening agents (OBAs) in manufactured white products. OBAs absorb short-wavelength light present in natural daylight, as well as in halogen and incandescent lamps, and convert the energy to blue light. The OBA essentially causes a color shift that is perceived as a bright and clean white. Many white objects including fabrics, paper, plastics, and others contain these whiteness-enhancing OBAs.
The OBA trick does not play well with many LEDs. Conventional LEDs use primarily blue emission and do not deliver short-wavelength radiation. They are thus unable to excite OBAs, making white objects appear dull and yellowish. A solution is the use of high -efficiency violet pump LEDs that correctly excite OBAs and render whites accurately. The amount of violet light can be precisely tuned to emulate the whiteness rendering of natural light sources.
converts the short-wavelength energy as shown in the graph on the left. (For background information on color science see the multipart series that concluded in LEDs Magazine last year.) The figure compares how the human visual system would perceive the color of commercial white paper illuminated by different light sources with identical 3000K CCTs. The example compares a halogen source, a conventional LED (# 1) with no OBA excitation, and a high-QoL LED (# 2) with OBA excitation. The violet energy in LED # 2 is tuned to match the halogen lamp and the pair result in color uniformity within a 1-step MacAdam ellipse (also called SDCM or standard deviation of color matching) LED # 1, meanwhile, results in a 7-step color error -. meaning that the paper appears cream colored rather than bright white.
In fact, not all high-CRI LEDs perform similarly when you consider all aspects of QoL. Table 1 compares GaN-on-GaN, -sapphire, and -silicon-carbide LEDs side-by-side for similar 800-lm flux levels. The data came directly from the manufacturer datasheets in the case of the Cree and Nichia LEDs. We see that for similar input power and efficacy levels, the QoL for the violet-primary GaN-on-GaN LED is much higher. The comparison shows that the raw performance of the GaN-on-GaN LED can overcome the inherent efficiency penalties of using a primary violet emitter resulting in Stokes' loss and the use of deep red phosphor that radiates some energy outside the human visual sensitivity range. The GaN-on -GaN LED delivers the QoL aspects we associate with natural lighting.
Does such superior color and whiteness rendering truly matter to users? To assess this, Professor Kevin Houser at Penn State University recently organized a study comparing the perceptual response to two LED MR16 lamps. The study included a conventional LED lamp (Ra = 84, R9 = 24), and a high-QoL LED lamp (Ra = 97, R9 = 88). Participants were presented with two side-by-side booths displaying a retail environment. They were asked to make visual comparisons and indicate their preference for various . colors The results, summarized in Fig 2, show that users easily perceived a difference and strongly preferred the high-QoL option -. both for colors and whites.
Research using a prototypical retail scene had test subjects evaluate lighting in side-by-side booths (a). The participants expressed a strong preference for the booth that used a high-QoL LED source when judging the appearance of both whites and colors (b ).
The crucial importance of QoL for the broad adoption of energy-saving lighting technology is clearly exemplified by the inability of compact fluorescent lamps (with their mediocre QoL) to win over end users / customers. Hence, it is perhaps surprising that the QoL topic has not been a subject of focus from more LED manufacturers. The good news is that the disruptive performance leap offered by native GaN substrates finally enables high-performance products with uncompromising QoL.
Another aspect of high lumen density enabled by GaN-on-GaN is its ability to deliver small LED source sizes while maintaining high light output or brightness along with high QoL. This aspect of a light source is critical when narrow beams of light are required. It's generally easier to control the beam from smaller sources.
Let's consider the source size issue relative to a replacement lamp that is difficult to achieve with led street lighting fixture. The AR111 is a professional lamp that can not compromise on light quality and requires very narrow beam angles. Until now, there have been few LED-based AR111 lamps on the market and those that do exist suffer from the typical LED problems of poor beam quality, low Ra, poor color uniformity, multiple shadows, and form factors too big to fit into existing fixtures.
more info you can visit:http://www.lead-lighting.com/products/sid108-1.htm
The latest GaN-on-GaN LEDs will afford the headroom from a performance perspective to allow a focus on better light. The third-generation devices exhibit peak wall-plug efficiency of 80% (at 85 ° C), and 65% at 150 A / cm2, a current density five (or more) times higher than for LEDs based on foreign substrates. The practical benefits of this recent performance leap are twofold. First, it enables a compelling LED-based solution in systems running at high temperature and high current densities, where conventional LED technology has struggled. And the headroom provided by increased efficiency can be spent on light quality.
Indeed, Quality of Light (QoL) must be considered as an essential property of light sources. QoL has many aspects, but perhaps the best known is color fidelity, measured by the color rendering index (CRI) Ra and the special index R9. The latter is important for deep reds but also, crucially, the tones of human skin. Most LED products aim moderately for Ra in the range of 80 and R9 above 0. This target is based on the often-held belief that such values are sufficient. On the other hand, higher-end options are also available with values as high as Ra = 95 and R9 = 95. Such higher color rendering requires photons at the ends of the spectrum (violet and deep red) and therefore comes at cost of efficiency . The superior efficiency of GaN-on-GaN technology will be crucial in supporting high CRI, as the efficiency headroom more than makes up for the penalties inherent at the high QoL levels.
Optical brightening agents
An equally important and often disregarded measure of light quality is whiteness rendering. While rendering of the color white may seem trivial, this is not the case due to the decades-old and near-ubiquitous use of optical brightening agents (OBAs) in manufactured white products. OBAs absorb short-wavelength light present in natural daylight, as well as in halogen and incandescent lamps, and convert the energy to blue light. The OBA essentially causes a color shift that is perceived as a bright and clean white. Many white objects including fabrics, paper, plastics, and others contain these whiteness-enhancing OBAs.
The OBA trick does not play well with many LEDs. Conventional LEDs use primarily blue emission and do not deliver short-wavelength radiation. They are thus unable to excite OBAs, making white objects appear dull and yellowish. A solution is the use of high -efficiency violet pump LEDs that correctly excite OBAs and render whites accurately. The amount of violet light can be precisely tuned to emulate the whiteness rendering of natural light sources.
converts the short-wavelength energy as shown in the graph on the left. (For background information on color science see the multipart series that concluded in LEDs Magazine last year.) The figure compares how the human visual system would perceive the color of commercial white paper illuminated by different light sources with identical 3000K CCTs. The example compares a halogen source, a conventional LED (# 1) with no OBA excitation, and a high-QoL LED (# 2) with OBA excitation. The violet energy in LED # 2 is tuned to match the halogen lamp and the pair result in color uniformity within a 1-step MacAdam ellipse (also called SDCM or standard deviation of color matching) LED # 1, meanwhile, results in a 7-step color error -. meaning that the paper appears cream colored rather than bright white.
In fact, not all high-CRI LEDs perform similarly when you consider all aspects of QoL. Table 1 compares GaN-on-GaN, -sapphire, and -silicon-carbide LEDs side-by-side for similar 800-lm flux levels. The data came directly from the manufacturer datasheets in the case of the Cree and Nichia LEDs. We see that for similar input power and efficacy levels, the QoL for the violet-primary GaN-on-GaN LED is much higher. The comparison shows that the raw performance of the GaN-on-GaN LED can overcome the inherent efficiency penalties of using a primary violet emitter resulting in Stokes' loss and the use of deep red phosphor that radiates some energy outside the human visual sensitivity range. The GaN-on -GaN LED delivers the QoL aspects we associate with natural lighting.
Does such superior color and whiteness rendering truly matter to users? To assess this, Professor Kevin Houser at Penn State University recently organized a study comparing the perceptual response to two LED MR16 lamps. The study included a conventional LED lamp (Ra = 84, R9 = 24), and a high-QoL LED lamp (Ra = 97, R9 = 88). Participants were presented with two side-by-side booths displaying a retail environment. They were asked to make visual comparisons and indicate their preference for various . colors The results, summarized in Fig 2, show that users easily perceived a difference and strongly preferred the high-QoL option -. both for colors and whites.
Research using a prototypical retail scene had test subjects evaluate lighting in side-by-side booths (a). The participants expressed a strong preference for the booth that used a high-QoL LED source when judging the appearance of both whites and colors (b ).
The crucial importance of QoL for the broad adoption of energy-saving lighting technology is clearly exemplified by the inability of compact fluorescent lamps (with their mediocre QoL) to win over end users / customers. Hence, it is perhaps surprising that the QoL topic has not been a subject of focus from more LED manufacturers. The good news is that the disruptive performance leap offered by native GaN substrates finally enables high-performance products with uncompromising QoL.
Another aspect of high lumen density enabled by GaN-on-GaN is its ability to deliver small LED source sizes while maintaining high light output or brightness along with high QoL. This aspect of a light source is critical when narrow beams of light are required. It's generally easier to control the beam from smaller sources.
Let's consider the source size issue relative to a replacement lamp that is difficult to achieve with led street lighting fixture. The AR111 is a professional lamp that can not compromise on light quality and requires very narrow beam angles. Until now, there have been few LED-based AR111 lamps on the market and those that do exist suffer from the typical LED problems of poor beam quality, low Ra, poor color uniformity, multiple shadows, and form factors too big to fit into existing fixtures.
more info you can visit:http://www.lead-lighting.com/products/sid108-1.htm
Acuity develops in-room wireless controls and enterprise lighting network
On consecutive days, Acuity Brands has announced the xCella wireless controls platform designed as a simple way of controlling led street light wholesale and legacy lighting at the room level, and the XPoint system that provides a building-level mesh network for larger installations. The xCella product uses energy -harvesting technology enabling wireless sensors and switches to function without direct access to AC power. Both of the new offerings are being sold under Acuity's Lighting Control & Design brand.
xCella and energy harvesting
The xCella platform includes sensors, switches, and relay-based load controls that can be applied in solid-state lighting (SSL) retrofit or new-building installations. Indeed, the technology can control any lighting, HVAC, or other load. The primary target of the technology is simple control installations within a room, although the platform can be scaled to support larger installations.
The xCella platform includes sensors, switches, and relay-based load controls that can be applied in solid-state lighting (SSL) retrofit or new-building installations.
While in its press announcement, Acuity did not specify the source of the underlying technology used in the xCella platform, Lighting Design & Control is identified on the EnOcean Alliance website as using the wireless network scheme promulgated by that organization. Moreover, a number of vendors offer enabling technologies that can be used to develop wireless switches and sensors that support the scheme.
The typical switch operates by harvesting the kinetic energy generated by a person depressing a switch to awaken a low-power microcontroller (MCU) that in turn sends a brief wireless message to a paired node - for example, a load control relay to which a table lamp is connected or an LED light fixture with integrated EnOcean support.
We covered a demonstration of the energy harvesting technology at last year's The LED Show by Illumra. Moreover, at the Light + Building trade fair earlier this year, Philips Lighting demonstrated the Tap wireless control for its Hue product family that is based on EnOcean technology.
Acuity will deliver a wide variety of modular products in the xCella family. Wireless switches can be installed in junction boxes or surface mounted to walls. The family includes sensors for occupancy and light and window / door sensors. The wireless load-control modules can switch AC power based on a wireless message. There is also a gateway product than can be used to expand the system beyond the room level and connect the system to centralized controllers.
XPoint mesh platform
The XPoint mesh system, meanwhile, is based on the proprietary wireless network original developed by Adura Technologies. Acuity acquired the assets of Adura back in early 2013.
The XPoint mesh system is based on the proprietary wireless network original developed by Adura Technologies.
Adura's value proposition from the startup stage was full integration of the control scheme into the light fixture. The mesh network can be used to commission or set programmatic routines in the fixture, but the fixture is then able to operate autonomously based on local light or occupancy sensors, or predetermined sequences based on the clock or calendar.
Indeed, Acuity refers to the XPoint system as fixture-integrated wireless controls. Acuity is specifically targeting applications including covered parking areas, high-bay spaces, corridors, and stairwells with the new platform.
"The XPoint Wireless cree xsp series led street light control system makes wireless fixture-by-fixture or group control of lighting in outdoor spaces simple to deploy," said Lance Hollner, director of Acuity Controls. "Using proven Adura wireless technology, the system brings fixtures and sensors together into a reliable mesh network. This provides high-speed response from control to fixture. "
The advantage of fixture integration is presumably reliability and the fact that the design lighting-control scheme can operate without an active gateway or controller present. Once commissioned, fixtures will operate as programmed, including responding to local sensors, even if the network fails.
The XPoint offering initially includes drives enabled with the wireless support, a variety of sensors that can connect with the drivers, load-control modules, and XPoint Wireless Gateways that link the mesh network to a corporate IT network via Ethernet. Such a system would be managed by Acuity's Unity family of lighting management software platforms.
more info you can visit:http://www.lead-lighting.com/products/sid109-1.htm
xCella and energy harvesting
The xCella platform includes sensors, switches, and relay-based load controls that can be applied in solid-state lighting (SSL) retrofit or new-building installations. Indeed, the technology can control any lighting, HVAC, or other load. The primary target of the technology is simple control installations within a room, although the platform can be scaled to support larger installations.
The xCella platform includes sensors, switches, and relay-based load controls that can be applied in solid-state lighting (SSL) retrofit or new-building installations.
While in its press announcement, Acuity did not specify the source of the underlying technology used in the xCella platform, Lighting Design & Control is identified on the EnOcean Alliance website as using the wireless network scheme promulgated by that organization. Moreover, a number of vendors offer enabling technologies that can be used to develop wireless switches and sensors that support the scheme.
The typical switch operates by harvesting the kinetic energy generated by a person depressing a switch to awaken a low-power microcontroller (MCU) that in turn sends a brief wireless message to a paired node - for example, a load control relay to which a table lamp is connected or an LED light fixture with integrated EnOcean support.
We covered a demonstration of the energy harvesting technology at last year's The LED Show by Illumra. Moreover, at the Light + Building trade fair earlier this year, Philips Lighting demonstrated the Tap wireless control for its Hue product family that is based on EnOcean technology.
Acuity will deliver a wide variety of modular products in the xCella family. Wireless switches can be installed in junction boxes or surface mounted to walls. The family includes sensors for occupancy and light and window / door sensors. The wireless load-control modules can switch AC power based on a wireless message. There is also a gateway product than can be used to expand the system beyond the room level and connect the system to centralized controllers.
XPoint mesh platform
The XPoint mesh system, meanwhile, is based on the proprietary wireless network original developed by Adura Technologies. Acuity acquired the assets of Adura back in early 2013.
The XPoint mesh system is based on the proprietary wireless network original developed by Adura Technologies.
Adura's value proposition from the startup stage was full integration of the control scheme into the light fixture. The mesh network can be used to commission or set programmatic routines in the fixture, but the fixture is then able to operate autonomously based on local light or occupancy sensors, or predetermined sequences based on the clock or calendar.
Indeed, Acuity refers to the XPoint system as fixture-integrated wireless controls. Acuity is specifically targeting applications including covered parking areas, high-bay spaces, corridors, and stairwells with the new platform.
"The XPoint Wireless cree xsp series led street light control system makes wireless fixture-by-fixture or group control of lighting in outdoor spaces simple to deploy," said Lance Hollner, director of Acuity Controls. "Using proven Adura wireless technology, the system brings fixtures and sensors together into a reliable mesh network. This provides high-speed response from control to fixture. "
The advantage of fixture integration is presumably reliability and the fact that the design lighting-control scheme can operate without an active gateway or controller present. Once commissioned, fixtures will operate as programmed, including responding to local sensors, even if the network fails.
The XPoint offering initially includes drives enabled with the wireless support, a variety of sensors that can connect with the drivers, load-control modules, and XPoint Wireless Gateways that link the mesh network to a corporate IT network via Ethernet. Such a system would be managed by Acuity's Unity family of lighting management software platforms.
more info you can visit:http://www.lead-lighting.com/products/sid109-1.htm
Belkin delivers LED lamps based on its WeMo wireless network platform
Belkin International has announced the WeMo Smart cree xsp series led street light along with a starter kit that includes a bridge between Wi-Fi networks and the ZigBee wireless network that underlies the company's WeMo home-automation technology platform. The home-networking specialist used the giant Consumer Electronics Show (CES) as the venue to announce its entry into the lighting market.
The WeMo platform was designed to enable home automation with Belkin offering wirelessly-accesible products such as switchable AC outlets, light switches, motion sensors, light sensors, and even a baby monitor. The WeMo nodes are connected by the ZigBee wireless network and the WeMo Link devices provide a bridge between the ZigBee nodes and a home Wi-Fi network. That Wi-Fi network allows access to the nodes from locally-connected smartphones, tablets, or PCs, or via any remote device connected through the Internet.
The networking setup is similar to that offered by Philips Lighting in the Hue product family.
Moreover, ZigBee technology in general is inching toward status as a de facto standard for indoor lighting networks. Indeed, the Connected Lighting Alliance has tapped ZigBee as the recommended technology for residential applications.
"Since first launching at the 2012 International CES, WeMo has become a major player in the connected home thanks to its simple, scalable, and affordable nature - words not typically associated with the connected home," said Ohad Zeira, director of product management for WeMo. "As the most approachable entry point into the Smart Home, we are excited to introduce new products and app upgrades in 2014 that will continue that trend, as well as grow our business with Jarden Consumer Solutions and future partners to expand WeMo's presence throughout the house. "
The led street lighting Manufacturer offered initially by Belkin are 3000K, 800-lm, 60W-equivalent products projected for 23 years of life. Unlike Hue, the Belkin products produce only white light, although the lamps are fully dimmable. In fact, Belkin offers a dim -to-sleep function that gradually dims the light. The company said that mode is designed to have people fall asleep more naturally.
For control, Belkin supplies a WeMo app for both Apple iOS and Android devices. The WeMo platform is also compatible with the IFTTT (If This Then That) web service that allows users to set rules online that can then autonomously trigger actions in the lamps such as dim levels or on / off control.
Belkin is launching its solid-state lighting (SSL) presence with the WeMo LED Lighting Starter set priced at $ 129.99. The kit includes two of the LED lamps along with the wireless bridge and the control apps. The company will offer additional lamps for $ 39.99. As many as 50 lamps can be deployed on one ZigBee network.
more info you can visit:http://www.lead-lighting.com/products/sid106-1.htm
The WeMo platform was designed to enable home automation with Belkin offering wirelessly-accesible products such as switchable AC outlets, light switches, motion sensors, light sensors, and even a baby monitor. The WeMo nodes are connected by the ZigBee wireless network and the WeMo Link devices provide a bridge between the ZigBee nodes and a home Wi-Fi network. That Wi-Fi network allows access to the nodes from locally-connected smartphones, tablets, or PCs, or via any remote device connected through the Internet.
The networking setup is similar to that offered by Philips Lighting in the Hue product family.
Moreover, ZigBee technology in general is inching toward status as a de facto standard for indoor lighting networks. Indeed, the Connected Lighting Alliance has tapped ZigBee as the recommended technology for residential applications.
"Since first launching at the 2012 International CES, WeMo has become a major player in the connected home thanks to its simple, scalable, and affordable nature - words not typically associated with the connected home," said Ohad Zeira, director of product management for WeMo. "As the most approachable entry point into the Smart Home, we are excited to introduce new products and app upgrades in 2014 that will continue that trend, as well as grow our business with Jarden Consumer Solutions and future partners to expand WeMo's presence throughout the house. "
The led street lighting Manufacturer offered initially by Belkin are 3000K, 800-lm, 60W-equivalent products projected for 23 years of life. Unlike Hue, the Belkin products produce only white light, although the lamps are fully dimmable. In fact, Belkin offers a dim -to-sleep function that gradually dims the light. The company said that mode is designed to have people fall asleep more naturally.
For control, Belkin supplies a WeMo app for both Apple iOS and Android devices. The WeMo platform is also compatible with the IFTTT (If This Then That) web service that allows users to set rules online that can then autonomously trigger actions in the lamps such as dim levels or on / off control.
Belkin is launching its solid-state lighting (SSL) presence with the WeMo LED Lighting Starter set priced at $ 129.99. The kit includes two of the LED lamps along with the wireless bridge and the control apps. The company will offer additional lamps for $ 39.99. As many as 50 lamps can be deployed on one ZigBee network.
more info you can visit:http://www.lead-lighting.com/products/sid106-1.htm
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