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Showing posts with label incandescent light bulbs. Show all posts
Showing posts with label incandescent light bulbs. Show all posts

Wednesday, September 2, 2009

Europe’s Ban on Old-Style Bulbs Begins


BRUSSELS — Restrictions on the sale of incandescent bulbs begin going into effect across most of Europe on Tuesday in the continent’s latest effort to get people to save energy and combat global warming. But even advocates concede the change is proving problematic.


Leon Neal/Agence France-Presse — Getty Images

Stores in the European Union will no longer be allowed to buy or import most incandescent frosted glass bulbs starting Tuesday.

Under the European Union rules, shops will no longer be allowed to buy or import most incandescent frosted glass bulbs starting Tuesday. Retailers can continue selling off their stock until they run out.

While some Europeans are eagerly jumping on the bandwagon, others are panicking and have been stockpiling the old-style bulbs for aesthetic or practical reasons. Others are resigned to the switch, if grudgingly.

“Why are we switching? Because we have to,” said Ralph Wennig, a 40-year-old photographer shopping on Monday at BHV, a Paris department store.

The new compact fluorescent lamps are billed as more economical in the long run because they use up to 80 percent less energy and do not burn out as quickly.

“But the downside is that the light isn’t as nice,” Mr. Wennig said, “and they are more expensive individually.”

One bulb can cost €10, or $14 — or a lot more, depending on type — whereas traditional incandescent bulbs cost about 70 cents each. But E.U. officials argued that the energy savings would cut average household electricity bills by up to €50 a year, amounting to about €5 billion annually. That would help buoy the economy if consumers spent their savings, they said.

At a briefing Monday in Brussels, however, they also were defending themselves against charges that they were depriving children of traditional fairground lights, and dealing with more serious questions about health hazards from the mercury in the new lamps.

Such arguments have already started to reverberate in the United States, where incandescent bulbs are due to be phased out starting in 2012.

Until then, the E.U. is providing the biggest staging ground for both the conversion as well as a debate over trade-offs created by environmental legislation. The issues include the loss of long-standing manufacturing industries, consumer choice and possible exacerbation of other environmental hazards.

The ban is one of a series of measures to support the E.U. goal of cutting greenhouse gas emissions by 20 percent by 2020. Everything from televisions to washing machines to tiny motors are being made more energy-efficient.

But the light bulb ban has proved singular in the way it has stirred fierce debate. The ubiquity of lighting and the way it can alter the aesthetics of an interior, even the experience of reading a book, makes it somehow more personal.

E.U. countries are not the first to ban incandescent light bulbs, but they are in the vanguard.

Australia has already introduced a ban and Cuba has entirely shifted to compact fluorescent bulbs, according to Andras Toth, an expert with the European Commission, the E.U. executive agency.

Consumer advocates in Europe have cautiously welcomed the measures but they also have pointed to drawbacks for consumers — especially those who have a special sensitivity to certain kinds of light or need old-style bulbs for health reasons.

“The blanket ban could spell misery for thousands of epilepsy and anxiety sufferers who are adversely affected by energy-saving bulbs,” said Martin Callanan, a European Parliament member.

He also warned that the new bulbs would not work in all types of fixtures nor with dimmer switches, and that they would give off a harsh light.

E.U. officials sought to reassure consumers that they still would have plenty of choice, and that the changes would be gradual. The clear 60-watt bulb, one of the most commonly used, would remain available until at least September 2011, and clear 40-watt bulbs until 2012.

National governments will be responsible for enforcing the rules.

However, the European Commission acknowledged that compact fluorescent lamps had to be handled with extra caution. If one breaks, people are advised to air out rooms and avoid using vacuum cleaners when cleaning up the mess to prevent exposure to mercury and other electronic parts in the bulbs, officials said. Instead, householders should remove the debris with a wet cloth while avoiding contact with skin. Used bulbs should be put in special collection receptacles, officials said.

Stephen Russell, the secretary general of ANEC, a group representing consumer interests in the development of product standards, said the commission had set the limit for mercury too high.

E.U. officials said that they would find ways to push the industry to reduce the amount of mercury to levels around 2 milligrams per bulb from the current level of 5 milligrams per bulb.

The effects of the ban are likely to be felt first at the checkout counter, where supplies of old-style bulbs soon could dry up entirely.

In Germany, consumers have been taking the precaution of stockpiling old-style light bulbs. Sales of incandescent bulbs have increased by 34 percent during the first half of this year, according to GfK, a consumer research organization.

“Some delay may happen before you get all possibilities at reasonable prices,” said André Brisaer, another European Commission official, who is helping to lead the phase-out.

Other consumers have complained that compact fluorescent bulbs do not last as long as incandescent bulbs when turned off and on like a standard bulb and that they take too long to illuminate fully. In those cases, commission officials have recommended that consumers use halogen bulbs, which brighten more quickly and are up to 45 percent more energy-efficient than incandescent bulbs.

But WWF, an environmental group, said standard halogen bulbs should also have been removed from the market.

“Getting rid of incandescents is a no-brainer, but halogens are nearly as wasteful,” said Mariangiola Fabbri, a senior energy policy officer for WWF.

As for fairgrounds, E.U. officials insisted that adequate replacements were available that would retain their soft-white traditional ambiance.

Judy Dempsey in Berlin and Lisa Pham and Alice Pfeiffer in Paris contributed reporting.

Monday, June 1, 2009

Regular Light Bulbs Made Super-Efficient with Ultra-Fast Laser

May 29th, 2009 Regular light bulbs made super-efficient with ultra-fast laser

Enlarge

Chunlei Guo stands in front of his femtosecond laser, which can double the efficiency of a regular incandescent light bulb. Credit: University of Rochester

(PhysOrg.com) -- An ultra-powerful laser can turn regular incandescent light bulbs into power-sippers, say optics researchers at the University of Rochester. The process could make a light as bright as a 100-watt bulb consume less electricity than a 60-watt bulb while remaining far cheaper and radiating a more pleasant light than a fluorescent bulb can.

The laser process creates a unique array of nano- and micro-scale structures on the surface of a regular tungsten filament—the tiny wire inside a light bulb—and theses structures make the tungsten become far more effective at radiating light.

The findings will be published in an upcoming issue of the journal .

"We've been experimenting with the way ultra-fast lasers change metals, and we wondered what would happen if we trained the laser on a filament," says Chunlei Guo, associate professor of optics at the University of Rochester. "We fired the right through the glass of the bulb and altered a small area on the filament. When we lit the bulb, we could actually see this one patch was clearly brighter than the rest of the filament, but there was no change in the bulb's energy usage."

The key to creating the super-filament is an ultra-brief, ultra-intense beam of light called a femtosecond laser pulse. The laser burst lasts only a few quadrillionths of a second. To get a grasp of that kind of speed, consider that a femtosecond is to a second what a second is to about 32 million years. During its brief burst, Guo's laser unleashes as much power as the entire grid of North America onto a spot the size of a needle point. That intense blast forces the surface of the metal to form nanostructures and microstructures that dramatically alter how efficiently can radiate from the filament.

In 2006, Guo and his assistant, Anatoliy Vorobeyv, used a similar laser process to turn any metal pitch black. The surface structures created on the metal were incredibly effective at capturing incoming radiation, such as light.

"There is a very interesting 'take more, give more' law in nature governing the amount of light going in and coming out of a material," says Guo. Since the black metal was extremely good at absorbing light, he and Vorobyev set out to study the reverse process—that the blackened filament would radiate light more effectively as well.

"We knew it should work in theory," says Guo, "but we were still surprised when we turned up the power on this bulb and saw just how much brighter the processed spot was."

In addition to increasing the brightness of a bulb, Guo's process can be used to tune the color of the light as well. In 2008, his team used a similar process to change the color of nearly any metal to blue, golden, and gray, in addition to the black he'd already accomplished. Guo and Vorobeyv used that knowledge of how to control the size and shape of the nanostructures—and thus what colors of light those structures absorb and radiate—to change the amount of each wavelength of light the tungsten filament radiates. Though Guo cannot yet make a simple bulb shine pure blue, for instance, he can change the overall radiated spectrum so that the tungsten, which normally radiates a yellowish light, could radiate a more purely white light.

Guo's team has even been able to make a filament radiate partially polarized light, which until now has been impossible to do without special filters that reduce the bulb's efficiency. By creating nanostructures in tight, parallel rows, some light that emits from the filament becomes polarized.

The team is now working to discover what other aspects of a common light bulb they might be able to control. Fortunately, despite the incredible intensity involved, the femtosecond laser can be powered by a simple wall outlet, meaning that when the process is refined, implementing it to augment regular light bulbs should be relatively simple.

Guo is also announcing this month in Applied Physics Letters a technique using a similar femtosecond process to make a piece of metal automatically move liquid around its surface, even lifting a liquid up against gravity.

Source: University of Rochester (news : web)