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11/22 |
2007/4/15-18 [Science/Electric] UID:46303 Activity:nil |
4/15 Popular Mechanics tests Compact Fluorescent Lights Bulbs http://urltea.com/5np (popularmechanics.com) http://urltea.com/5nq (popularmechanics.com - PDF) \_ Interesting, but oddly doesn't rate the most potentially annoying things about CFL bulbs. I use CFL bulbs throughout my house, a couple of different brands, and they vary in the following annoying issues. 1. Take longer to turn on than an incandesant bulb 2. They approch fully brightness slowly. 2. They approch full brightness slowly. 3. One brand actually produces a soft hum. All these issues should have been rated. -jrleek |
11/22 |
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urltea.com/5np -> www.popularmechanics.com/home_journal/home_improvement/4215199.html?series=15 The Best Compact Fluorescent Light Bulbs: PM Lab Test Can the new breed of energy-saving fluorescents hold their own against incandescents? We ran seven bulbs through our optical course to find out. Michael Patrissi, a lighting and production specialist at Popular Mechanics' parent company Hearst Magazines, tests the color temperature and lux of a compact fluorescent light bulb. Test Photographs by Philip Friedman/Studio D Published in the May 2007 issue. The compact fluorescent light bulb revolution nearly occurred back in the early 1990s. When CFLs first hit the market in force, consumers bought them in large numbers -- but they hated them. The bulbs were too big for many fixtures, expensive (up to $25 each) and they threw a dim, antiseptic light that paled next to the warmth of good old-fashioned incandescent bulbs. Retail giants are pushing hard for the bulbs -- Wal-Mart hopes to sell 100 million CFLs by the end of the year. In California, a legislator recently proposed banning the sale of incandescent light bulbs in the state by 2012. All the old benefits of CFLs are still significant -- more so, in fact. They can use less than one-third the electricity of incandescent bulbs of equivalent brightness and last up to nine years. The new bulbs are smaller and far cheaper (about $5 each) than their predecessors, and more powerful than ever. Top-end 24-watt bulbs promise brightness equivalent to that of a 150-watt incandescent. Still, when it comes to illuminating your home, brightness isn't everything. Can CFLs match the light quality of the energy-wasting incandescents we know and love? Popular Mechanics designed a test pitting seven common CFLs against a 75-watt incandescent bulb. To gather objective data, we used a Konica Minolta CL-200 chroma meter to measure color temperature and brightness, and a Watts up? Our subjective data came from a double-blind test with three PM staffers and Jesse Smith, a lighting expert from Parsons The New School for Design, in Manhattan. We put our participants in a color-neutral room and asked them to examine colorful objects, faces and reading material, then rate the bulbs' performance. Even though the incandescent bulb measured slightly brighter than the equivalent CFLs, our subjects didn't see any dramatic difference in brightness. And here was the real shocker: When it came to the overall quality of the light, all the CFLs scored higher than our incandescent control bulb. In other words, the new fluorescent bulbs aren't just better for both your wallet and the environment, they produce better light. CFL BACKGROUND Color temperature: The lower the color temperature, the warmer the light. Warmness (red) or coolness (blue) can be measured in degrees Kelvin by a chroma meter. We observed a temperature of about 2700 K for soft white bulbs, whereas "daylight" bulbs measured around 3400 K -- real noontime sunlight ranges from 5000 K to 6500 K Lumens vs. lux: Manufacturers use a complex process to measure lumens, the total quantity of light emitted by a bulb. We used a light and chroma meter to measure lux, the light intensity a bulb shines on a surface. Our observed results in lux generally tracked with manufacturers' lumen ratings. Watts and efficiency: Our ammeter's CFL wattage results were all within 3 watts of manufacturer ratings -- but all CFLs use about 70 percent less electricity than incandescent bulbs. Phosphor: This chemical compound lines the inside of CFL tubing. When excited, it converts ultraviolet radiation into visible light. The chemical composition of the phosphor determines the color temperature of the light emitted by the bulb. Mercury: According to the EPA, CFLs contain an average of 5 milligrams of mercury, which increases the bulb's efficiency. But that also means you can't just trash them--CFLs must be properly recycled. tiny yet powerful sources of light that are even more energy efficient than CFLs. Manufacturing LEDs that produce light equivalent to a 60-watt bulb is expensive, however. The Boy Mechanic Culled from a half-century of Popular Mechanics issues (make that the first half of last century), The Boy Mechanic represents an age when imagination could conquer far more than the checkbook -- when solving a problem was more satisfying than paying to have it go away. |
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popularmechanics.com The carmakers now introduce new models all year long, so the idea of a "model year" has blurred. But our interactive Black Book pricing is still crisp and clear. The German navy may use a version of the Northrop Grumman Global Hawk Unmanned Aerial Vehicle (UAV) for maritime surveillance. POPULAR MECHANICS was on hand when a test version, called the Euro Hawk, made a pinpoint landing at Nordholz Air Base near Cuxhaven, Germany. Whether you call it Old Glory or the Stars and Stripes, the flag of the United States is indeed grand and old. Its shape and general configuration were adopted by Congress on June 14, 1777, a day that is now known as Flag Day. Opportunity's and Spirit's roving missions seemed to go smoothly, right? Based on the enormous amount of media coverage they received, you would think so. We're on the scene around the world -- Detroit, New York, Chicago, Los Angeles, Frankfurt, Tokyo, Paris, Geneva, and even Toronto. |