Study looks at ‘excited’ lightbulb atoms July 10, 2009Posted by Dr. Z Bulbs in incandescent light bulb, light bulb, Theory for argument sake..
Tags: excited atoms, fluorescent, fluorescent light bulb, fluorescent lighting, fluorescent tube, light, light bulb, light bulbs, lightbulb, Technology of a light bulb
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Zoinks! Its me Dr. Z! Light bulbs are in the news all over the place and its seems that everybody’s atom are getting excited about the possibility of the perfect light source.. and speaking of excited atoms check out the story below on how “excited”
Study looks at ‘excited’ lightbulb atomsJuly 10, 2009 – 5:24PM A groundbreaking study measuring how long atoms stay “excited” could help scientists build better and more energy efficient lightbulbs, its authors say. Researchers from the Australian National University in Canberra found excited helium atoms – a key ingredient in most fluorescent lighting – remained in that state for 8,000 seconds or just over two hours. The precise finding could lead the way to building more efficient lights, Professor Ken Baldwin said. The year-long study shone a light into the murky world of excited atoms, he said. “Without that exact data, you are in some degree working in the dark,” he told AAP. “It’s a piece of fundamental scientific evidence that could be well utilised in the lighting industry.” Lightbulbs are charged by igniting gases, such as helium, with electricity, Prof Baldwin said. This simple discovery of knowing how long atoms stay excited would help technicians to potentially use less electricity. The research team used lasers to isolate a cloud of helium atoms within a vacuum, measuring the rate at which they emitted ultraviolet photons to revert back to their normal, stable state. Prof Baldwin said there had been just one earlier attempt by scientists to measure the duration of excited helium atoms, but it had not been accurate. This latest finding was correct to within six per cent.
Tags: incandescent light bulb, incandescent lightbulb, laser, laser light bulbs, LED, light, light bulb, light bulbs, lightbulb, spiral, Technology of a light bulb
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The battle of the light bulb may not be quite over. While traditional incandescents will soon be phased out in the United States and abroad, researchers are plugging away to create more efficient versions that comply with looming new standards — while also providing an alternative for consumers who find compact fluorescents objectionable [The New York Times, blog]. In one new study, researchers have demonstrated how an incandescent bulb can be modified to give out much more light without requiring more power.
Lead researcher Chunlei Guo and his colleagues were experimenting with the effect of ultrafast laser pulses on metals when they noticed that pulses lasting only a few femtoseconds–quadrillionths of a second–could fundamentally change the molecular arrangement of metals without melting them [ScienceNOW Daily News]. The laser blasts caused the metal to turn black, which boosted its ability to absorb light. Because the law of thermal radiation state that materials that can absorb a great deal of energy will also emit large amounts of energy, the researchers decided to see if their laser treatment would boost the light output of the metal filament in an ordinary light bulb.
They fired a femtosecond laser beam through the glass of an off-the-shelf incandescent bulb. As expected, the lightning-fast beam rearranged the molecules of the bulb’s tungsten filament, turning it dark black. But then, when the researchers turned the bulb on, the part treated with the laser shone considerably brighter than the rest of the filament [ScienceNOW Daily News]. When they gave an entire filament the laser treatment, an altered 60-watt light bulb glowed as brightly as a 100-watt bulb, but still used its normal amount of electricity.
The findings, which will be published in the next issue of Physical Review Letters, may not be ready for commercialization just yet, but Guo believes it would not be difficult for bulb companies to add a tungsten blackening step to the manufacturing process. “The implementation should be fairly straightforward,” he said [The New York Times, blog]. However, compact-fluorescent bulbs and light-emitting diode (LED) bulbs are already on the market, and research is continuing on how to make those technologies cheaper, more pleasing to the eye, and still more efficient, so the laser treatment may not be enough to give new life to the old-fashioned light bulb.
LED article. Are we going to get the lead out on using LEDS? March 16, 2009Posted by Dr. Z Bulbs in List Article, Theory for argument sake..
Tags: LED, led lighting, light emitting diodes
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Zoinks! LED are the illumination device to be getting lots of press in the last year? Could they be the future of lighting? I don’t know… I still haven’t seen anything that has knocked my socks off (more on that later)but they would look good on the Starship Enterprise! The article below is a great introduction to some of the more positive views on LED technology!Dr Z
Future bright for LED lights in homes
Light-emitting diodes (LEDs) that can be used as home lighting are becoming more common, but the cheaper-to-use and environmentally friendly devices are still relatively expensive to install.
Electric device makers are expanding their LED product lineups as production costs edge down, and are expected to become the principle lighting devices of the future.
LEDs are semiconductors that emit light when a current passes through them. The electric appliance industry has nicknamed LED technology as the fourth light, after candles, lightbulbs and fluorescent lamps.
LED lights are smaller, lighter, more durable and consume less electricity than conventional lighting products. They already are used in traffic signals, as back lights for cell phones and in other products. But it is only recently that LEDs have made the leap to household lighting equipment.
Toshiba Lighting & Technology Corp. is scheduled to release Wednesday LED lightbulbs that can be used with conventional lightbulb bayonet mounts. The products have the same level of brightness as a 40-watt lightbulb.
Though priced at 10,500 yen, including consumption tax, it is said to have a 40,000-hour life span. This makes the devices 40 times more durable than conventional light bulbs and about seven times that of the company’s fluorescent lamps. If an LED light was used for 10 hours every day, it would last more than 10 years. Because LEDs also use much less electricity than a lightbulb, using one for 40,000 hours–about 10 years of normal use–means electric bills would be about 20,000 yen lower than using an ordinary lightbulb for the same length of time.
Panasonic Electric Works Co. plans to increase its home-use LED lineup from 80 products to 210 starting next month. Its LED downlight priced at 25,620 yen has the same level of brightness as a 60-watt light bulb. The products’ life span also is 40,000 hours and is said to be able to cut annual utility fees by about 85 percent.
The biggest hurdle for LED lighting is the high price, but production costs are steadily declining.
Kuniaki Matsukage, Panasonic Electric Works’ director of lighting equipment, said, “Around 2012, I predict that prices of our LED products will be halved, and I believe they’ll be the most common form of lighting equipment.”
(Mar. 16, 2009)
Last Day, 2008 burn bulbs at both ends. December 31, 2008Posted by Dr. Z Bulbs in Theory for argument sake., Uncategorized.
Tags: light bulbs
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I have heard people say that it costs less to leave your lights bulbs on all night rather than turning them off? How in the world can this be? It is so with a certain bulb called a Metal Halide, but not with a regular incandescent or a CFL or Spiral bulbs. Now if your purchasing your bulbs at the Big Box Stores, you may be purchasing an inferior quality bulb, make sure to read the fine print and look at your products closely.
Incandescent light bulbs, What’s happening now? November 20, 2008Posted by Dr. Z Bulbs in Theory for argument sake..
Tags: Energy saving, energy saving compact light bulb, government controls, Technology of a light bulb
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Government has abandoned the idea to phase out traditional (incandescent) light bulbs in favour of energy efficient bulbs. It is up to households to decide which light bulbs they want to use. Instead they are using tax incentives to encourage thier use. Why are they so involved?