COMMeMOratiVe ISSue - Illuminating Engineering Society

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L E T T E R S LEDs Take Flight I was pleased to see the first issue of LD+A themed to LED applications (November 2005). In addition to the issues of quantity, quality, CRI and consistency raised in Kevin Dowling’s excellent article (“Crossing the Chasm”), there are a few other issues that are equally important to lighting professionals. The LED community needs to “talk the talk” of the lighting industry. This includes moving away from lamp efficacy only and providing data on the system efficacy (including the drivers) and system efficiency (how much of the available light is actually getting out). The behavior of most conventional light sources is well understood, but the LED industry needs to agree on a standard for measuring and publishing lumen maintenance, as well as variations in light output due to temperature variations. When LED luminaires for general illumination are available, and the necessary information is properly provided in standard format, then lighting practitioners can consider selecting LED products for specific applications. Jeffrey D. Schwartz ICF Consulting, Albany, NY I am enjoying the November LD+A, devoted in large part to LEDs. I would have enjoyed it much more if there was a small advertisement for IESNA TM-16-05! TM16 is a great all-in-one publication that covers the history of the LED, efficacy issues, life issues, lumen maintenance issues, explains how they are made and even does some forecasting of where this “moving target” will be in the next five, 10 and 15 years. The section on “three ways of making white light” even gives designers the advantages and disadvantages to each. The IESNA Light Sources Committee did a great job on this publication and I think it should be on every “lighting geek’s” shelf. Doug Paulin Packerland Lighting Sales, Egg Harbor, WI The article “Finally Blue” (LD+A, November) makes a one-sentence reference to FarLight, “...80 LED fixtures from FarLight, Wilmington, CA are used...” Unfortunately, it is not clear from the article that FarLight’s luminaires are completely different from the pictured Ledtronics’ “jelly jar.” FarLight’s luminaire, with unique toroidal non-imaging optic, was specifically designed for the Vincent Thomas Bridge project. We provided a high intensity f a n - s h a p e d beam light pattern with visibility up to 10 miles using only five high brightness LEDs. We think that readers would have appreciated an explanation of distinction between two totally different LED luminaire design concepts, especially in an issue dedicated to LED lighting. Robert H. Tudhope FarLight LLC, Wilmington, CA PRESIDENT Alan L. Lewis, O.D., Ph.D., FIES The New England College of Optometry PAST PRESIDENT Craig A. Bernecker The Lighting Education Institute SENIOR VICE PRESIDENT (President-Elect) Kevin Flynn Kiku Obata & Company VP-EDUCATIONAL ACTIVITIES Ronald Gibbons, Ph.D. Virginia Tech Transportation Institute VP-TECHNICAL & RESEARCH Pekka Hakkarainen Lutron Electronics Co. Inc. VP-DESIGN & APPLICATION Joseph B. Murdoch, Ph.D., FIES University of New Hampshire (retired) VP-MEMBER ACTIVITIES Kimberly Szinger Stantec Consulting TREASURER Boyd Corbett S2C Incorporated EXECUTIVE VICE PRESIDENT William Hanley, CAE IESNA DIRECTORS David A. Baum Holophane James Cyre Philips Lighting Terrance Kilbourne, LC TEC, Inc. Denis Lavoie, LC Lumec, Inc Russ Owens, LC West Coast Design Group RVP/DIRECTORS Craig Kohring mda engineering, inc. Thomas Tolen, LC TMT Associates 2005-2006 Board of Directors IESNA www.iesna.org
L E T T E R S A Second Look at the ‘Vision Thing’ Brian Liebel raises two interesting points in his “Hot Button” column (LD+A, November). First, he asks, “Should we, as lighting professionals, use a different standard than optometrists” The answer is both no and yes, depending on what we, as lighting professionals, want to use the standard for. Where we are interested in the effect of lighting conditions on visual acuity then it would be madness to use any metric other than that used by optometrists. But when we are choosing a light source for application there are many other light source characteristics of interest, so it would then be madness to confine our considerations to visual acuity alone. Second, he avers that fine adjustments in vision at the threshold level impact reading speed and visual comfort for normal reading tasks. This is true up to a point, that point being where the target is three to four times larger than threshold, i.e. when it subtends three to four min arc at the eye. All I can say in response to his assertion is that in the study he references we measured the speed and accuracy of identifying the orientation of Landolt rings with gaps sized from 1.5 min arc to 14 min arc. We certainly found the expected increase in reading speed with increasing gap size but we found no statistically significant effect of spectrallyenhanced lighting. If Brian wishes to claim that spectrally-enhanced lighting improves reading speed for print sizes used in practice, I suggest he makes some measurements of normal reading tasks done with and without spectrally-enhanced lighting at the same illuminance and publishes the results. As principle investigator for research in the field of spectrally-enhanced lighting for the U.S. Department of Energy, he is surely in a position to do so. Peter R. Boyce, Fellow, IESNA Canterbury, Kent, Great Britain Reflections of a Member Emeritus Fifty years of IESNA membership is not noteworthy in itself, requiring only living long enough and paying dues. During the years I did however come to love and embrace lighting, while lighting in turn enveloped me. Lighting sales provided my livelihood while lighting design offered me excitement. Lighting, IES and IALD with their cadres of design professionals earned their places along with architecture and AIA. First limited to New York and other major cities, lighting designers began to appear on projects of all types and sizes and in all locales. Lighting design moved away from a tradition wherein electrical engineers and architects just “did” the lighting design along with their other (and more important) design functions for which they had been trained. Two pioneers of lighting design exposed me to its limitless potential. Bill Lam and I first became acquainted when we represented his lighting manufacturing company, Lam, Inc. His approach to lighting design, independent of commercial influences, struck a chord with me—it just made sense. Claude Engle and I met while he worked in his father’s engineering firm in Washington, DC. He continues today to produce exceptional designs and has spawned a generation of awardwinning professionals. There have been times of disaffection with the IES—during the 1950s, ‘60s and early ‘70s with the everescalating recommended levels of illuminance. The <strong>Society</strong> was publishing standards which were in turn supported and promoted shamelessly by the producers of lamps, lighting fixtures and electric power. As a salesman; I found myself out of step with my peers of the day. Someone at that time characterized IES as follows: “We cannot decide whether we are a professional society or an industry trade group.” That was then, this is now. Forty years later, we need only to compare current issues of LD+A with their predecessors of that period to recognize and respect our present level of collective maturity—as a <strong>Society</strong>, a profession and an industry. Dick Dunlop, Member Emeritus Chesapeake Lighting Associates Columbia, MD Clarification “Bringing the Great Outdoors Inside” (LD+A, September) noted that the Atlanta Area Council Boy Scouts of America Volunteer Service Center received a 2004 IIDA Award of Merit. That award went to designers Matthew Hartley and Sean McLendon. www.iesna.org
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