It can be hard to understand a new system, and as the brand new LED items make their own way into public fingers, it will be necessary to discover ways to see the product packaging. It may seem strange a brand new form of lighting might require fresh knowledge, yet despite having the particular increasingly accessible CFL light bulbs the situation is identical.
CFL manufacturers have circumvented the issue through putting the existing equal plainly upon the product packaging, which is why all of them say "60 Watt replacement" to make concerns easy. The newest method will require light bulbs to be listed together with lumens, not w.
What's a Lumen?
Lumens look at the final amount of packets of light produced by an easy source, the industry difficult means of stating simply how much mild a source puts out. We've grow to be accustomed to calculating light simply by watts. The typical incandescent bulbs simply put out about A dozen lumens for each w associated with electrical power they take in. On the other hand, LED bulbs produce concerning 60-100 lumens for every w.
Replacement Beliefs
Because LED light bulbs can produce a lot more lumens for each w of electrical power utilized, they are much more efficient. Realizing that doesn't help a lot when you are getting to the store and try to work out which light bulb to have when you need an upgraded.
A 40 watt bulb produces regarding 400-500 lumens. Any 60 watt light generates about Eight hundred lumens plus a One hundred watt light bulb generates 1400-1700 lumens, provide or even take.
Having the approximate number of lumens that to look will help you steer clear of getting house the wrong light bulbs. For example, when choosing bulbs to replace those who work in the chandelier which uses Twenty five watt bulbs, which usually coincidentally produce concerning 300 lumens, you wouldn't want to get 2.5w LED light because the form is correct : which light bulb just generates 4 lumens.
Knowing the variety of lumens is important to be able to acquiring the appropriate LED lights. Take a chart together with you just in case you come across lights which are only noticeable inside lumens, a coming pattern. Furthermore, research the the labels carefully - CFL bulbs packaged in the almost identical fashion to be able to LED lights, and also you shouldn't buying the incorrect point.
2011年4月26日 星期二
2011年4月20日 星期三
Lemon lamp a bright idea
Lemon lamp a bright idea
When life gives you lemons — make electricity.
Well, that’s what 10 year old Gabe Davey must have heard, because instead of fixing a refreshing summer drink, the Claude E. Garton Public School student MacGuyvered a lamp using little more than the sour fruit and an LED bulb.
Davey’s experiment was one of over 100 science projects on display at Lakehead University’s C.J. Sanders Fieldhouse gym on Tuesday. The Northwestern Ontario Regional Science Fair had students from grades 4 to 12 from across the region showcasing a diverse range of experiments.
“My goal in this was to examine how many fruits it would take to light the bulb, and my question was what fruit would take the least,” explained Davey, who pitted lemons, oranges and grapefruits against each other in a battle of citrus supremacy.
Lemons came out on top with only three needed to light up the bulb.
Fionna Fenlon’s eye-catching experiment titled “How Haunted is Your House?” dealt with a phantom of the energy kind — the electricity that household items waste even when turned off, often referred to as phantom energy.
“It’s nothing about Ghostbusters, sorry to disappoint,” Fenlon joked before explaining the worst perpetrators of phantom energy, such as old TVs, desktop computer towers, and laptops that are kept plugged in after they have finished charging.
Fenlon, a Grade 10 student from Sir Winston Churchill high school, tested different electronics using a voltmeter and said that by unplugging rarely-used electronics, money can be saved and our carbon footprint can be reduced.
Students could choose any topic they liked, and like Fenlon, many had an environmental angle. Proof of the importance that environmental protection was on the students’ minds.
For the record, there were no exhibits either proving or disproving the existence of ghosts, so that mystery still remains.
Chelsea Kubinec’s experiment may have lacked a fun prop like a vinegar-fuelled volcano — and yes, there was a volcano — but her experiment on how age correlates with gender stereotyping was just as intriguing.
Kubinec said she was bothered by the way gender is portrayed in marketing as well as the stereotypical jokes she heard from others, so she created a survey that tested people’s beliefs based on their age.
“I focused on gender stereotyping because I hear so many people make stereotypical jokes, so I wanted to make people aware that they are hurtful, and I wanted to display it with actual results,” Kubinec explained.
The St. Ignatius High School student found that older adults tend to believe gender stereotypes, but that the trend rapidly declines for the 17- to 24-year-old demographic, a promising result to be sure.
Michael Kisro, a Grade 6 student from Sacred Heart School in Sioux Lookout, built a miniature steam-powered boat using only copper tubing and a candle to propel it forward, demonstrating the properties of steam and water pressure.
“I wanted to do a steam train but that would be a bit harder,” said Kisro, who spent one day building the boat and another two constructing his board of information.
Brendan Sawanas and Kansis Mandamin, two grade 10 students from Thomas Fiddler Memorial High School, ran a series of tests to see if humans could develop echolocation, the biological sonar used by bats and dolphins to “hear their surroundings.”
Indeed, tests showed that blindfolded students could make sounds and hear echoes to navigate. High-frequency clicking sounds worked best, and young students fared better than teachers, supporting the belief that hearing degrades with age.
Awards for the Northwestern Ontario Regional Science Fair will be given out tonight from 7 to 8:30 p.m. in Lakehead University’s Bora Laskin Auditorium.
When life gives you lemons — make electricity.
Well, that’s what 10 year old Gabe Davey must have heard, because instead of fixing a refreshing summer drink, the Claude E. Garton Public School student MacGuyvered a lamp using little more than the sour fruit and an LED bulb.
Davey’s experiment was one of over 100 science projects on display at Lakehead University’s C.J. Sanders Fieldhouse gym on Tuesday. The Northwestern Ontario Regional Science Fair had students from grades 4 to 12 from across the region showcasing a diverse range of experiments.
“My goal in this was to examine how many fruits it would take to light the bulb, and my question was what fruit would take the least,” explained Davey, who pitted lemons, oranges and grapefruits against each other in a battle of citrus supremacy.
Lemons came out on top with only three needed to light up the bulb.
Fionna Fenlon’s eye-catching experiment titled “How Haunted is Your House?” dealt with a phantom of the energy kind — the electricity that household items waste even when turned off, often referred to as phantom energy.
“It’s nothing about Ghostbusters, sorry to disappoint,” Fenlon joked before explaining the worst perpetrators of phantom energy, such as old TVs, desktop computer towers, and laptops that are kept plugged in after they have finished charging.
Fenlon, a Grade 10 student from Sir Winston Churchill high school, tested different electronics using a voltmeter and said that by unplugging rarely-used electronics, money can be saved and our carbon footprint can be reduced.
Students could choose any topic they liked, and like Fenlon, many had an environmental angle. Proof of the importance that environmental protection was on the students’ minds.
For the record, there were no exhibits either proving or disproving the existence of ghosts, so that mystery still remains.
Chelsea Kubinec’s experiment may have lacked a fun prop like a vinegar-fuelled volcano — and yes, there was a volcano — but her experiment on how age correlates with gender stereotyping was just as intriguing.
Kubinec said she was bothered by the way gender is portrayed in marketing as well as the stereotypical jokes she heard from others, so she created a survey that tested people’s beliefs based on their age.
“I focused on gender stereotyping because I hear so many people make stereotypical jokes, so I wanted to make people aware that they are hurtful, and I wanted to display it with actual results,” Kubinec explained.
The St. Ignatius High School student found that older adults tend to believe gender stereotypes, but that the trend rapidly declines for the 17- to 24-year-old demographic, a promising result to be sure.
Michael Kisro, a Grade 6 student from Sacred Heart School in Sioux Lookout, built a miniature steam-powered boat using only copper tubing and a candle to propel it forward, demonstrating the properties of steam and water pressure.
“I wanted to do a steam train but that would be a bit harder,” said Kisro, who spent one day building the boat and another two constructing his board of information.
Brendan Sawanas and Kansis Mandamin, two grade 10 students from Thomas Fiddler Memorial High School, ran a series of tests to see if humans could develop echolocation, the biological sonar used by bats and dolphins to “hear their surroundings.”
Indeed, tests showed that blindfolded students could make sounds and hear echoes to navigate. High-frequency clicking sounds worked best, and young students fared better than teachers, supporting the belief that hearing degrades with age.
Awards for the Northwestern Ontario Regional Science Fair will be given out tonight from 7 to 8:30 p.m. in Lakehead University’s Bora Laskin Auditorium.
2011年4月18日 星期一
Releases Eco-Friendly LED Lights
a DisplayShops specialty website, has just released a new line of LED trade show lights that comply with the North American “Go Green” initiative. The LED lights, sold in bundles of two, use five watts of power each. This number is considerably lower than the amount of energy conventional LED light bulbs use.
“The set of LED lights burn more slowly than incandescent, halogen, or even our competitors LED lights,” states Sandra Reno, the New Product Advertiser for AllBannerStands.com. “The result is a system that is not only in compliance with the “Go Green” low voltage standards, but also safer technology. These LED lights run cooler, which helps prevent against fires.”
The set of LED lights are designed primarily for spotlighting advertisements and other displays. Each light is attached to a 20” long rod. These rods have clamps at the end for attaching to the top of a trade show poster or banner. There is a 20 foot long cord included with each model for convenient plugging into an electrical outlet. Although designed for Waveline graphic walls, these LED lights can attach to most poster frames and table tops.
“Even though these lighting systems use only five watts of energy, they are designed to be as effective as any other LED light,” adds Reno. “The lights are designed to cover 10 foot posters with a substantial amount of light.”
“The set of LED lights burn more slowly than incandescent, halogen, or even our competitors LED lights,” states Sandra Reno, the New Product Advertiser for AllBannerStands.com. “The result is a system that is not only in compliance with the “Go Green” low voltage standards, but also safer technology. These LED lights run cooler, which helps prevent against fires.”
The set of LED lights are designed primarily for spotlighting advertisements and other displays. Each light is attached to a 20” long rod. These rods have clamps at the end for attaching to the top of a trade show poster or banner. There is a 20 foot long cord included with each model for convenient plugging into an electrical outlet. Although designed for Waveline graphic walls, these LED lights can attach to most poster frames and table tops.
“Even though these lighting systems use only five watts of energy, they are designed to be as effective as any other LED light,” adds Reno. “The lights are designed to cover 10 foot posters with a substantial amount of light.”
Ruud Lighting expanding Racine facility by 220,000 square feet
Ruud Lighting expanding Racine facility by 220,000 square feet
Racine-based Ruud Lighting has started work on a 220,000 square foot addition to its approximate 500,000 square foot headquarters and production facility. The project, expected to be completed later this year, will be used for the company’s distribution center.
The space that is now used for distribution will be converted for expanded production, said Christopher Ruud, president.
The company is expanding because of the increasing demand for its commercial and industrial lighting products, especially its BetaLED line of LED lights. In 2010, Ruud Lighting had record sales levels, which it anticipates continuing this year, largely because of the continued demand for LED products.
“When we’re adding assembly lines, it’s on the LED front,” Ruud said.
Some of BetaLED’s most prominent selling products have been its street light fixtures, which are in place in Los Angeles, Boston, Anchorage, Alaska, and several other communities in California. The city of Ouray, Colo., has converted all of its street lights to the company’s LED fixtures.
“We have the most installed LED street lights in the U.S. (of any manufacturer),” Ruud said.
Racine-based Ruud Lighting has started work on a 220,000 square foot addition to its approximate 500,000 square foot headquarters and production facility. The project, expected to be completed later this year, will be used for the company’s distribution center.
The space that is now used for distribution will be converted for expanded production, said Christopher Ruud, president.
The company is expanding because of the increasing demand for its commercial and industrial lighting products, especially its BetaLED line of LED lights. In 2010, Ruud Lighting had record sales levels, which it anticipates continuing this year, largely because of the continued demand for LED products.
“When we’re adding assembly lines, it’s on the LED front,” Ruud said.
Some of BetaLED’s most prominent selling products have been its street light fixtures, which are in place in Los Angeles, Boston, Anchorage, Alaska, and several other communities in California. The city of Ouray, Colo., has converted all of its street lights to the company’s LED fixtures.
“We have the most installed LED street lights in the U.S. (of any manufacturer),” Ruud said.
2011年4月14日 星期四
County installing LED signals at Belleville intersection.
New traffic signals will grace the intersection of Belleville and Franklin avenues, compliments of Essex County. Construction is expected to start this week and last through August.
The intersection of Belleville and Franklin Led light avenues is part of an Essex County road construction project. Existing traffic signals will be replaced with more modern ones which include Light Emitting Diode lenses and cameras, according to the county, which maintains both roads.
"[LED] bulbs use about 90 percent less energy than traditional incandescent bulbs, last longer and are more visible in inclement weather," a press release states. The signals will also include an eight-hour battery backup to be used in the event of an electrical outage.
The cameras - like those on traffic signals at Union Avenue and Holmes Street - will help regulate traffic flow. If the cameras do not detect traffic in one direction, signals will remain green for motorists traveling in the opposing direction.
Additionally, pedestrian signals will have countdown timers to let people know how many seconds they have to cross the Led light street before the light changes. Also making pedestrians' lives easier, handicapped accessible ramps will be installed at each of the intersection's corners.
According to a notice on the township's website, impacted roadways will remain open during the signal construction, but some nearby driveways may be intermittently inaccessible. Seeking further information, the Times repeatedly reached out to county engineers and the county executive's press office. Neither source returned email messages or phone calls.
The county's traffic project in Belleville is estimated to cost $304,607, according to the press release. The project is funded by state transportation improvement grants, the release states. The Led light state's exact contribution is unclear.
According to Belleville Police Chief Joseph Rotonda, there were no safety concerns at the intersection that prompted the need for upgrades.
"That's actually one of the better intersections in town," Rotonda said.
The intersection of Belleville and Franklin Led light avenues is part of an Essex County road construction project. Existing traffic signals will be replaced with more modern ones which include Light Emitting Diode lenses and cameras, according to the county, which maintains both roads.
"[LED] bulbs use about 90 percent less energy than traditional incandescent bulbs, last longer and are more visible in inclement weather," a press release states. The signals will also include an eight-hour battery backup to be used in the event of an electrical outage.
The cameras - like those on traffic signals at Union Avenue and Holmes Street - will help regulate traffic flow. If the cameras do not detect traffic in one direction, signals will remain green for motorists traveling in the opposing direction.
Additionally, pedestrian signals will have countdown timers to let people know how many seconds they have to cross the Led light street before the light changes. Also making pedestrians' lives easier, handicapped accessible ramps will be installed at each of the intersection's corners.
According to a notice on the township's website, impacted roadways will remain open during the signal construction, but some nearby driveways may be intermittently inaccessible. Seeking further information, the Times repeatedly reached out to county engineers and the county executive's press office. Neither source returned email messages or phone calls.
The county's traffic project in Belleville is estimated to cost $304,607, according to the press release. The project is funded by state transportation improvement grants, the release states. The Led light state's exact contribution is unclear.
According to Belleville Police Chief Joseph Rotonda, there were no safety concerns at the intersection that prompted the need for upgrades.
"That's actually one of the better intersections in town," Rotonda said.
Ecosystems for Solid State Lighting 2011
Ecosystems for Solid State Lighting 2011
IntertechPira is pleased to announce the dates for the 1st installment of Ecosystems for Solid State Lighting. The launch of this visionary event will take place November 30-December 2, 2011 at the Washington Marriott in Washington, DC . Chaired by Kathryn Conway from LED Consulting and Dr. Makarand Chipalkatti from OSRAM Sylvania, Ecosystems for Solid State Lighting 2011 will provide an intersection for big-picture "system thinkers" in the information and lighting industries to brainstorm and learn how really maximize the opportunities that solid state lighting (SSL) technology offers.
"Lighting touches so many different parts of design. We're just beginning to integrate new and existing technologies with all of the other components of a lighting ecosystem," said Dr. Chipalkatti.
"We envision Ecosystems for Solid State Lighting 2011 as a launch point for companies, government, clean energy advocates and others to collaborate. Together we can plan how to link SSL to smart electrical grids, advanced transport systems, social networking, surveillance and security, industrial efficiency, and other forward-thinking initiatives," added Kathryn M.Conway. "For this conference, we agree that it's time to get past simply replacing old light bulbs!"
Through approximately 18 expert presentations assessing market trends, technical development and application related advances, Ecosystems for Solid State Lighting 2011 will provide a new understanding of the diverse systems, their components and developing framework to achieve interoperability of devices and systems for SSL. The target audience includes advanced materials and systems manufacturers; computer systems, utilities, and information providers & facilitators; investors; architects and lighting designers, as well as policy-makers and government agencies and academics.
The conference will include one day of pre-conference seminars and workshops to allow for more in-depth coverage of issues and additional networking opportunities. Sponsorship and exhibition opportunities are available.
IntertechPira is pleased to announce the dates for the 1st installment of Ecosystems for Solid State Lighting. The launch of this visionary event will take place November 30-December 2, 2011 at the Washington Marriott in Washington, DC . Chaired by Kathryn Conway from LED Consulting and Dr. Makarand Chipalkatti from OSRAM Sylvania, Ecosystems for Solid State Lighting 2011 will provide an intersection for big-picture "system thinkers" in the information and lighting industries to brainstorm and learn how really maximize the opportunities that solid state lighting (SSL) technology offers.
"Lighting touches so many different parts of design. We're just beginning to integrate new and existing technologies with all of the other components of a lighting ecosystem," said Dr. Chipalkatti.
"We envision Ecosystems for Solid State Lighting 2011 as a launch point for companies, government, clean energy advocates and others to collaborate. Together we can plan how to link SSL to smart electrical grids, advanced transport systems, social networking, surveillance and security, industrial efficiency, and other forward-thinking initiatives," added Kathryn M.Conway. "For this conference, we agree that it's time to get past simply replacing old light bulbs!"
Through approximately 18 expert presentations assessing market trends, technical development and application related advances, Ecosystems for Solid State Lighting 2011 will provide a new understanding of the diverse systems, their components and developing framework to achieve interoperability of devices and systems for SSL. The target audience includes advanced materials and systems manufacturers; computer systems, utilities, and information providers & facilitators; investors; architects and lighting designers, as well as policy-makers and government agencies and academics.
The conference will include one day of pre-conference seminars and workshops to allow for more in-depth coverage of issues and additional networking opportunities. Sponsorship and exhibition opportunities are available.
2011年4月11日 星期一
Montreal mayor fires comptroller in spying scheme
The mayor of Montreal has fired the city's comptroller and demanded his former right-hand man at city council resign over details of a spying scheme that now involves police.
But Claude Dauphin, the city council chairman and Lachine borough mayor says he won't step down and has done nothing wrong.
Dauphin was the target of an internal investigation led by city comptroller Pierre Reid, mayor Gérald Tremblay confirmed Monday at a news conference called after days of speculation.
The probe uncovered "troubling facts" including allegations involving Dauphin and a Lachine demolition company, Tremblay said.
Those findings are now in provincial police hands, and Dauphin should step down until an investigation is complete, the mayor urged.
Dauphin was supposed to chair a regularly-scheduled city council meeting Monday afternoon, after Tremblay's news conference.
Pierre Reid, the controversial comptroller who investigated Dauphin has also been removed from his job, but will remain a city employee.
Reid's methodology has come under fire in the past, namely for "spying" on auditor general Jacques Bergeron last year.
But Claude Dauphin, the city council chairman and Lachine borough mayor says he won't step down and has done nothing wrong.
Dauphin was the target of an internal investigation led by city comptroller Pierre Reid, mayor Gérald Tremblay confirmed Monday at a news conference called after days of speculation.
The probe uncovered "troubling facts" including allegations involving Dauphin and a Lachine demolition company, Tremblay said.
Those findings are now in provincial police hands, and Dauphin should step down until an investigation is complete, the mayor urged.
Dauphin was supposed to chair a regularly-scheduled city council meeting Monday afternoon, after Tremblay's news conference.
Pierre Reid, the controversial comptroller who investigated Dauphin has also been removed from his job, but will remain a city employee.
Reid's methodology has come under fire in the past, namely for "spying" on auditor general Jacques Bergeron last year.
A Sunless, Rainless Room Indoors
A Sunless, Rainless Room Indoors
Farming is moving indoors, where the sun never shines, where rainfall is irrelevant and where the climate is always right.
The perfect crop field could be inside a windowless building with meticulously controlled light, temperature, humidity, air quality and nutrition. It could be in a New York high-rise, a Siberian bunker, or a sprawling complex in the Saudi desert.
Advocates say this, or something like it, may be an answer to the world's food problems.
"In order to keep a planet that's worth living on, we have to change our methods," says Gertjan Meeuws, of PlantLab, a private research company.
The world already is having trouble feeding itself. Half the people on Earth live in cities, and nearly half of those — about 3 billion — are hungry or malnourished. Food prices, currently soaring, are buffeted by droughts, floods and the cost of energy required to plant, fertilize, harvest and transport it.
And prices will only get more unstable. Climate change makes long-term crop planning uncertain. Farmers in many parts of the world already are draining available water resources to the last drop. And the world is getting more crowded: by mid-century, the global population will grow from 6.8 billion to 9 billion, the U.N. predicts.
To feed so many people may require expanding farmland at the expense of forests and wilderness, or finding ways to radically increase crop yields.
Meeuws and three other Dutch bioengineers have taken the concept of a greenhouse a step further, growing vegetables, herbs and house plants in enclosed and regulated environments where even natural light is excluded.
In their research station, strawberries, yellow peppers, basil and banana plants take on an eerie pink glow under red and blue bulbs of Light-Emitting Diodes, or LEDs. Water trickles into the pans when needed and all excess is recycled, and the temperature is kept constant. Lights go on and off, simulating day and night, but according to the rhythm of the plant — which may be better at shorter cycles than 24 hours — rather than the rotation of the Earth.
In a larger "climate chamber" a few miles away, a nursery is nurturing cuttings of fittonia, a colorful house plant, in two layers of 70 square meters (750 sq. feet) each. Blasts of mist keep the room humid, and the temperature is similar to the plants' native South America. After the cuttings take root — the most sensitive stage in the growing process — they are wheeled into a greenhouse and the chamber is again used for rooting. The process cuts the required time to grow a mature plant to six weeks from 12 or more.
The Dutch researchers say they plan to build a commercial-sized building in the Netherlands of 1,300 square meters (14,000 sq. feet), with four separate levels of vegetation by the end of this year. After that, they envision growing vegetables next to shopping malls, supermarkets or other food retailers.
Meeuws says a building of 100 sq meters (1,075 sq. feet) and 14 layers of plants could provide a daily diet of 200 grams (7 ounces) of fresh fruit and vegetables to the entire population of Den Bosch, about 140,000 people. Their idea is not to grow foods that require much space, like corn or potatoes. "We are looking at the top of the pyramid where we have high value and low volume," he said.
Sunlight is not only unnecessary but can be harmful, says Meeuws. Plants need only specific wavelengths of light to grow, but in nature they must adapt to the full range of light as a matter of survival. When light and other natural elements are manipulated, the plants become more efficient, using less energy to grow.
"Nature is good, but too much nature is killing," said Meeuws, standing in a steaming cubicle amid racks of what he called "happy plants."
For more than a decade the four researchers have been tinkering with combinations of light, soil and temperature on a variety of plants, and now say their growth rate is three times faster than under greenhouse conditions. They use no pesticides, and about 90 percent less water than outdoors agriculture. While LED bulbs are expensive, the cost is steadily dropping.
Olaf van Kooten, a professor of horticulture at Wageningen University who has observed the project but has no stake in it, says a kilogram (2.2 pounds) of tomatoes grown in Israeli fields needs 60 liters (16 gallons) of water, while those grown in a Dutch greenhouse require one-quarter of that. "With this system it is possible in principle to produce a kilo of tomatoes with a little over one liter of water," he said.
The notion of multistory greenhouses has been around for a while. Dickson Despommier, a retired Columbia University professor of environmental health and author of the 2010 book "The Vertical Farm," began working on indoor farming as a classroom project in 1999, and the idea has spread to several startup projects across the U.S.
"Over the last five year urban farming has really gained traction," Despommier said in a telephone interview.
Despommier argues that city farming means producing food near the consumer, eliminating the need to transport it long distances at great costs of fuel and spoilage and with little dependency on the immediate climate.
The science behind LED lighting in agriculture "is quite rigorous and well known," he said, and the costs are dropping dramatically. The next development, organic light-emitting diodes or OLEDs, which can be packed onto thin film and wrapped around a plant, will be even more efficiently tuned to its needs.
One of the more dramatic applications of plant-growing chambers under LED lights was by NASA, which installed them in the space Shuttle and the space station Mir in the 1990s as part of its experiment with microgravity.
"This system is a first clear step that has to grow," Van Kooten says, but more research is needed and people need to get used to the idea of sunless, landless agriculture.
"But it's clear to me a system like this is necessary."
Farming is moving indoors, where the sun never shines, where rainfall is irrelevant and where the climate is always right.
The perfect crop field could be inside a windowless building with meticulously controlled light, temperature, humidity, air quality and nutrition. It could be in a New York high-rise, a Siberian bunker, or a sprawling complex in the Saudi desert.
Advocates say this, or something like it, may be an answer to the world's food problems.
"In order to keep a planet that's worth living on, we have to change our methods," says Gertjan Meeuws, of PlantLab, a private research company.
The world already is having trouble feeding itself. Half the people on Earth live in cities, and nearly half of those — about 3 billion — are hungry or malnourished. Food prices, currently soaring, are buffeted by droughts, floods and the cost of energy required to plant, fertilize, harvest and transport it.
And prices will only get more unstable. Climate change makes long-term crop planning uncertain. Farmers in many parts of the world already are draining available water resources to the last drop. And the world is getting more crowded: by mid-century, the global population will grow from 6.8 billion to 9 billion, the U.N. predicts.
To feed so many people may require expanding farmland at the expense of forests and wilderness, or finding ways to radically increase crop yields.
Meeuws and three other Dutch bioengineers have taken the concept of a greenhouse a step further, growing vegetables, herbs and house plants in enclosed and regulated environments where even natural light is excluded.
In their research station, strawberries, yellow peppers, basil and banana plants take on an eerie pink glow under red and blue bulbs of Light-Emitting Diodes, or LEDs. Water trickles into the pans when needed and all excess is recycled, and the temperature is kept constant. Lights go on and off, simulating day and night, but according to the rhythm of the plant — which may be better at shorter cycles than 24 hours — rather than the rotation of the Earth.
In a larger "climate chamber" a few miles away, a nursery is nurturing cuttings of fittonia, a colorful house plant, in two layers of 70 square meters (750 sq. feet) each. Blasts of mist keep the room humid, and the temperature is similar to the plants' native South America. After the cuttings take root — the most sensitive stage in the growing process — they are wheeled into a greenhouse and the chamber is again used for rooting. The process cuts the required time to grow a mature plant to six weeks from 12 or more.
The Dutch researchers say they plan to build a commercial-sized building in the Netherlands of 1,300 square meters (14,000 sq. feet), with four separate levels of vegetation by the end of this year. After that, they envision growing vegetables next to shopping malls, supermarkets or other food retailers.
Meeuws says a building of 100 sq meters (1,075 sq. feet) and 14 layers of plants could provide a daily diet of 200 grams (7 ounces) of fresh fruit and vegetables to the entire population of Den Bosch, about 140,000 people. Their idea is not to grow foods that require much space, like corn or potatoes. "We are looking at the top of the pyramid where we have high value and low volume," he said.
Sunlight is not only unnecessary but can be harmful, says Meeuws. Plants need only specific wavelengths of light to grow, but in nature they must adapt to the full range of light as a matter of survival. When light and other natural elements are manipulated, the plants become more efficient, using less energy to grow.
"Nature is good, but too much nature is killing," said Meeuws, standing in a steaming cubicle amid racks of what he called "happy plants."
For more than a decade the four researchers have been tinkering with combinations of light, soil and temperature on a variety of plants, and now say their growth rate is three times faster than under greenhouse conditions. They use no pesticides, and about 90 percent less water than outdoors agriculture. While LED bulbs are expensive, the cost is steadily dropping.
Olaf van Kooten, a professor of horticulture at Wageningen University who has observed the project but has no stake in it, says a kilogram (2.2 pounds) of tomatoes grown in Israeli fields needs 60 liters (16 gallons) of water, while those grown in a Dutch greenhouse require one-quarter of that. "With this system it is possible in principle to produce a kilo of tomatoes with a little over one liter of water," he said.
The notion of multistory greenhouses has been around for a while. Dickson Despommier, a retired Columbia University professor of environmental health and author of the 2010 book "The Vertical Farm," began working on indoor farming as a classroom project in 1999, and the idea has spread to several startup projects across the U.S.
"Over the last five year urban farming has really gained traction," Despommier said in a telephone interview.
Despommier argues that city farming means producing food near the consumer, eliminating the need to transport it long distances at great costs of fuel and spoilage and with little dependency on the immediate climate.
The science behind LED lighting in agriculture "is quite rigorous and well known," he said, and the costs are dropping dramatically. The next development, organic light-emitting diodes or OLEDs, which can be packed onto thin film and wrapped around a plant, will be even more efficiently tuned to its needs.
One of the more dramatic applications of plant-growing chambers under LED lights was by NASA, which installed them in the space Shuttle and the space station Mir in the 1990s as part of its experiment with microgravity.
"This system is a first clear step that has to grow," Van Kooten says, but more research is needed and people need to get used to the idea of sunless, landless agriculture.
"But it's clear to me a system like this is necessary."
2011年4月1日 星期五
Dimmable PAR LED Bulbs offer energy consumption down to 7 W
PAR-style high-power, high-efficacy lamps are available in PAR20 styles with energy consumption of 7 W, PAR30 units with 12 W consumption, and PAR38 bulbs that use 15 W. Edison medium screw-base and GU24 bi-pin base bulbs operate either in 120 Vac dimmable or in voltage input range of 90-290 Vac. Featuring 3,200°K warm-white led light, UL-listed units have CRI of 82 for optimal color and focused beam of 45°, which generates brightness from 333-762 lumens depending on model.
Growing LED Sector Dragged Down by Industry Leaders
The light-emitting diode (LED) market has grown in recent years due to the rise in sales of consumer electronics products such as mobile phones and television screens. In addition LEDs are on the verge of overtaking both incandescent and fluorescent light bulbs in terms of use as governments, businesses and consumers seek to curb emissions. The rise in LED popularity has led to an overcrowded industry and a sudden surge in government-backed Chinese LED makers has eaten into the market shares held by the likes of Cree and Veeco Instruments. The Bedford Report examines the outlook for companies in the semiconductor equipment and materials industry and provides research reports on Cree, Inc.
Last week, LED heavyweight Cree pulled itself and many other notable names in the industry down after it warned that revenue for its fiscal third quarter will be well short of previous forecasts. "It has taken longer to work through customer inventories than previously anticipated and pricing was lower than the company had previously forecast," Cree said. Cree claims that LED component demand has improved post the Chinese New Year, but that revenue is below previous targets.
Reflecting on the industry in general, Cree CEO Chuck Swoboda believes the huge increase in chip production to service LED backlighting applications in recent years has put pressure on the rest of the market. Weak demand in backlighting has meant that lots of spare LED chips are now available for other applications.
Last week, LED heavyweight Cree pulled itself and many other notable names in the industry down after it warned that revenue for its fiscal third quarter will be well short of previous forecasts. "It has taken longer to work through customer inventories than previously anticipated and pricing was lower than the company had previously forecast," Cree said. Cree claims that LED component demand has improved post the Chinese New Year, but that revenue is below previous targets.
Reflecting on the industry in general, Cree CEO Chuck Swoboda believes the huge increase in chip production to service LED backlighting applications in recent years has put pressure on the rest of the market. Weak demand in backlighting has meant that lots of spare LED chips are now available for other applications.
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