Month: November 2012

Milking Lighting

A 2010 Oklahoma State study comparing LED with conventional lighting in dairies showed a 6% increase in milk production under LED. The question is why, which is uncertain. One theory…

A 2010 Oklahoma State study comparing LED with conventional lighting in dairies showed a 6% increase in milk production under LED.

The question is why, which is uncertain. One theory is the LED is more directed, possibly resulting in more feeding. Another is higher hormone production.

IOWA FARMER has the story here.

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A Guided Tour of SSL Area Light Sources

More on OLEDs … Jeannine Fisher and Mike Lu of Acuity Brands’ OLED Lighting Design Center presented, “A Guided Tour of SSL Area Light Sources – Past, Present and Future”…

More on OLEDs … Jeannine Fisher and Mike Lu of Acuity Brands’ OLED Lighting Design Center presented, “A Guided Tour of SSL Area Light Sources – Past, Present and Future” at LIGHTFAIR 2012.

The presentation covers various technologies, including OLED, and clearly explains the merits and metrics of each with an informative visual presentation. Beyond the specific light sources, exciting examples of new form factors and lighting paradigms made possible by these technologies are shown.

Check it out here.

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Are OLEDs Ready for Prime Time?

Lighting designer Stephen Blackman, principal of Blackman Design Associates, has authored a whitepaper, “Are OLED Panels Ready for Prime Time?” It begins: “Right now we see many custom architectural OLED…

Lighting designer Stephen Blackman, principal of Blackman Design Associates, has authored a whitepaper, “Are OLED Panels Ready for Prime Time?”

It begins:

“Right now we see many custom architectural OLED fixtures with high numbers of low brightness panels in exciting and sculptural forms at trade shows, in design magazine spreads and artistic installations as architectural focal points. The big question for many of us participating in the decorative and commercial fixture market is “Can it do anything we can sell today?” The answer: yes and no!”

It’s an interesting read, available here.

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Product Monday: LED Bollards by Williams Outdoor

Williams Outdoor, an H.E. Williams, Inc. brand, recently introduced a complete offering of LED outdoor bollards. Rated for 50,000 hours at 70% lumen maintenance (L70) and utilizing an 1100- or…

Williams Outdoor, an H.E. Williams, Inc. brand, recently introduced a complete offering of LED outdoor bollards. Rated for 50,000 hours at 70% lumen maintenance (L70) and utilizing an 1100- or 2000-lumen Zhaga standard spotlight module, Williams bollards are designed to meet performance expectations and accommodate rapidly changing LED technology.

Concrete or aluminum housings with flat, domed, or peaked tops are provided in sizes up to 12” diameter or square. Six standard aluminum finish colors and a variety of custom concrete housing colors are available to complement any outdoor application. Shielding options include clear or opal acrylic and a number of cast aluminum configurations. Made in the USA.

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DOE Releases CALiPER Application Summary Report on LED Recessed Wallwashers

The U.S. Department of Energy has completed Series 18 of testing through the DOE Solid-State Lighting CALiPER program. A summary of the results is now available for download on the…

The U.S. Department of Energy has completed Series 18 of testing through the DOE Solid-State Lighting CALiPER program. A summary of the results is now available for download on the DOE SSL website here.

Report 18 analyzes the performance of 17 LED recessed wallwasher luminaires. The products tested were diverse in luminous intensity distribution and lumen output—reflecting the varied applications in which recessed wallwashers are used—but were generally comparable to conventional wallwashers using a 32 W CFL or 20 W metal halide lamp. Several products were measured to have lumen output equivalent to 42 W CFL or 35 W metal halide lamps. As with many product categories, there is room for performance gains.

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Mike’s Monthly Minute: AC Versus DC

Mike Donovan of Edge Lighting describes AC versus dimming in the context of LED lighting and control in this humorous “monthly minute” video:

Mike Donovan of Edge Lighting describes AC versus dimming in the context of LED lighting and control in this humorous “monthly minute” video:

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California Lighting Efficiency Programs Save 285,000 kW Since 2010

The California Public Utilities Commission recently published a fact sheet regarding the success of the state’s 2010-2011 energy efficiency program by sector (lighting, HVAC, commercial, and residential), as outlined in…

The California Public Utilities Commission recently published a fact sheet regarding the success of the state’s 2010-2011 energy efficiency program by sector (lighting, HVAC, commercial, and residential), as outlined in the CPUC’s recently released report, 2010-2011 Energy Efficiency Annual Progress and Evaluation Report. (If the print on the fact sheet is too small, click here and look under “What’s New.”)

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ELECTRICAL CONTRACTOR Publishes Article About Light and Color

Lighting choices can affect how we perceive spaces, even the colors of objects and surfaces. As a result, lamp color characteristics are a critical factor in a wide range of…

Lighting choices can affect how we perceive spaces, even the colors of objects and surfaces. As a result, lamp color characteristics are a critical factor in a wide range of spaces, from high-end retail, where merchandise must be presented as vibrant and in its true colors, to offices, where good lighting renders faces naturally and facilitates interaction. Although almost all architectural lighting uses white light, white is available in many hues and color rendering abilities, providing a palette of choices for lighting spaces.

Check out this article I wrote for ELECTRICAL CONTRACTOR, which describes the science of color vision, popular metrics used to evaluate and predict the color performance of lighting products, and guidelines that can support successful application.

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Zhaga Specifications Promise Interchangeability of LED Sources

Below is an article I wrote about Zhaga, originally published in the October 2012 issue of TED: In a traditional light fixture, lamps, auxiliary components such as ballasts, and the…

Below is an article I wrote about Zhaga, originally published in the October 2012 issue of TED:

Cooper Lighting’s P3LED 3-in. LED recessed fixture, an expansion of the company’s IRIS series, utilizes modular construction (based on Zhaga Book 3), providing a clear upgrade path for the LED array and multivendor solutions.

In a traditional light fixture, lamps, auxiliary components such as ballasts, and the fixture itself connect using standard interfaces, providing three key benefits.

Manufacturers can specialize in what they do best—lamp, ballast/transformer or fixture design, facilitating product development. Owners can easily replace lamps and auxiliary components as they fail, making the fixture itself a durable installed product. And specifiers, owners and OEMs often have a choice of lamps and auxiliary components spanning multiple manufacturers, providing the benefits of competition.

Solid-state lighting introduced a new paradigm. Solid-state lights are not well suited to existing interfaces because of thermal and other penalties on performance. So while self-ballasted LED replacement lamps are available that fit conventional sockets, general light fixtures dedicated to LED lamping are typically highly engineered to optimize performance of this unique light source. The fixture may be designed so that the light source and power supply/driver cannot be replaced without replacing the fixture (making the fixture essentially a self-ballasted lamp), difficult to replace (major disassembly required), or relatively easy to replace, but using proprietary connections.

Enter the Zhaga Consortium, an alliance of manufacturers dedicated to creating voluntary specifications enabling true interchangeability of LED light sources, focusing on mechanical, photometric, thermal and electronic compatibility of modules and systems. Founded in 2010, it consists of more than 180 companies from around the world, including big names such as Acuity Brands, Cooper, Cree, GE, OSRAM SYLVANIA, Philips and Zumtobel. (“Zhaga,” by the way, is an arbitrary name for this group; it’s actually a waterfall in Sichuan, China.) In 2012, more than 30 manufacturers presented Zhaga-compliant LED products for the first time at major trade events.

Products that are Zhaga compliant carry the Zhaga logo. The specifications themselves are currently divided into six documents called “Books.” Book 1 provides general information. Books 2-6 cover socketable or spot LED light engines, with integrated or separate driver. The intention is for dimming control functionality to be incorporated into the specifications in the future. The LED light engine itself (LED module plus driver) is intentionally not covered, ensuring manufacturers can continue to innovate to develop continually better sources.

Interchangeability of LED sources using LED-specific interfaces can provide several major benefits. LED technology is constantly improving. By relying on stable interfaces, LED and LED fixture product development can be uncoupled, allowing LED companies to focus on innovation of the source without having to redesign fixtures every time a source changes. Standardized sources can be manufactured in higher volumes, helping to drive down costs. The specifier can choose light sources for a fixture from more than one supplier, providing the benefits of competition while reducing risk of being tied to a single manufacturer. And owners can replace LED components as they become obsolete, making the fixture durable and upgradable.

For more information about Zhaga, click here.

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