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September 23, 2009 Volume 10, Issue 15
Who's quoted in this week's issue?
Jim Beneke, Mickey Bharat, Dick Borsboom, Judith Ecker, Phil Gallagher, Michelle Gorel, James Ketchell, Jamal Quaffar, Roy Vallee |
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Voices: Avnet LightSpeed’s Cary Eskow: illuminating energy-efficient design
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| Cary Eskow |
As seen in EDN -- Cary Eskow is director of LightSpeed, the solid-state-lighting- and LED (light-emitting-diode)-business unit of Avnet Electronics Marketing. A 28-year Avnet veteran, he leads Avnet’s national team of illumination-focused engineers experienced in thermal, drive-stage, and optics design and has worked closely with LED manufacturers, advanced analog IC, and secondary optics vendors since receiving his first patent using LEDs two decades ago. He has published more than 30 articles and columns on HB-LED (high-brightness LED)-system design and is a member of the Underwriters Laboratory-8750 LED Standards Technical Panel. Eskow recently spoke to EDN about designing for the HB-LED market. Excerpts of that interview follow.
Why is the HB-LED market in the spotlight right now?
Initially, people are looking toward HB LEDs because of energy savings. The single greatest usage of energy in any building at around 25% tends to be lighting. Because of the physics involved and the way incandescents work, typically, an HB LED has three or four more times light output for any given amount of power input.
In California, Title 24 mandates that all structures have to have a certain amount of energy-efficient lighting. [You can achieve] energy efficiency by using compact fluorescents or other types of devices like that, but they all have mercury. There are about 13 states that have legislation pending or in force that restricts the use of or mandates special handling of mercury-containing lamps. So, at some point, you have a convergence of legislation that mandates energy-efficient lighting and other legislation that increases awareness of hazardous materials [such as] mercury. The only real lighting source that satisfies both is HB LEDs.
What’s the design challenge?
The challenge with LEDs is, with the exception of infrared LEDs, they get hot. Based on certain things that happen with the semiconductor, that heat cannot escape in the form of infrared energy. The most significant design challenge—the one that people typically don’t anticipate when they begin an HB-LED design—is pulling the heat out of the device.
HB LEDs are more energy-efficient than incandescent and fluorescent lights, but, at the system level, does that advantage fade because of power loss?
On the system level, it is it still far more advantageous to use an LED over an incandescent. An incandescent doesn’t have any converter, but maybe 5 to 7% of the energy that goes into a bulb comes out as white light. In an LED-based system, yes, when you convert from the ac power to the constant-current dc typical low voltage that an LED requires, there may be 10 or 15% of loss in the circuitry. However, you gain that [loss] back because so much of the input energy going into an LED is realized and radiated as useful light, not as infrared or ultraviolet or other things that you don’t want.
If you compare compact fluorescents or regular fluorescents, they are pretty efficient and are very close to what an LED can provide as far as lumens, which is the way you measure light per watt. However, there are some big negatives with fluorescent tubes and compact fluorescents. One of them is lifetime. They don’t last a long time. The second thing is that they are filled with mercury gas—not a lot, but it’s in there, and that’s why they are considered hazardous wastes.
Full Story>>
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Program provides schools with refurbished computers
As seen in The Arizona Republic -- Since its founding in 1997, the Arizona StRUTprogram has reburbished and recycled used computer equipment while providing technical skills and experience to high school and community-college students statewide.
"Intel and Motorola started this organization to help Arizona schools with computers they were no longer using," said Tom Mehlert, executive director of the Mesa-based nonprofit, an acronym for Students Refurbishing Used Technology.
Just last year, 349 Arizona schools and nonprofits received approximately 2,000 refurbished units through the program. Arizona StRUT reuses or refurbishes as much of the equipment as possible. Other components are recycled, which generates additional funding for the program.
StRUT's board of directors includes a number of area business and education leaders: Peggy LaShier, program specialist with the Mesa Public Schools; Jennifer McConnell, an Avnet employee; and Martin "Todd" Dorris, from Intel.
Twelve local schools participate in Arizona StRUT, including Red Mountain High School in Mesa and Mesa Community College, coordinated by Sharon Hain, and Mesa High School, coordinated by Ken Jacox; the East Valley Institute of Technology, coordinated by Edward Allen.
Mehlert expects to attract at least 400 students to the program at the participating schools.
At the same time, individuals and more than 100 companies - Intel, Emerson, APS, Honeywell, Avnet and small businesses - donate hardware or provide financial support. For eight years, adult volunteers have also donated time. Another corporate partner, Stardust Building Supplies, of Mesa and Phoenix, provides storage and drop-off centers.
"The organizations we have refurbished computers for include schools, day care centers, after-school and refugee programs, churches, other organizations," said Kevin Coe, a computer instructor at Metro Tech High School in Phoenix.
"The students learn the social responsibility of properly disposing e-waste," Coe added. "The students also gain the experience of using their skills to help others and contribute to their community. The Arizona StRUT experience is a positive thing to add to college and career applications and résumés."
Full Story >>
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AVNET, the AV logo and any other Avnet trademarks are registered trademarks of Avnet, Inc. Avnet, Inc. disclaims any proprietary interest or right in trademarks, service marks, trade names, brands or logos other than its own. Copyright © 2009 Avnet, Inc. All Rights Reserved. |
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Latest News Coverage
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Avnet Fun & Flying Day
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Avnet: Rot-weiß-rote Mustertochter
Note: Please refer to the attached PDF for the full text of the article.
EHZ, Austria
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Avnet Electronics Marketing
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