College Planning & Management

DEC 2012

College Planning & Management is the information resource for professionals serving the college and university market. Covering facilities, security, technology and business.

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LED Lighting Technology: Leading the Industry LED lighting technology has come a long way, and can now achieve light output, color quality, color rendering, and energy efficiency that rivals or surpasses fluorescent sources. LED light sources are more efficient than CFLs, contain no mercury, and offer a level of flexibility and control that no other type of light source can match. Moreover, LED lighting systems support a full range of indoor and outdoor lighting applications for an array of uses. 26 PHOTO © JUSTIN MACONOCHIE of lights in a typical academic building. Combined with good daylighting design and a well-integrated control package with vacancy/occupancy sensors and daylight harvesting, institutions can realize up to 70 percent savings in energy use for lighting. Efficient lighting can have a ripple effect in overall energy savings in a building and indeed, across a campus. We know that light bulbs generate heat, and in fact, the heat generated by a 60-watt standard light bulb is equivalent to the heat generated by the average person. By using fewer (and more efficient) light fi xtures throughout a space, less heat is generated, thus requiring less energy to cool the building — and perhaps a smaller air conditioning unit. The reduction in electricity used for lights can translate into significant savings for campus buildings with air conditioning. High-efficiency linear fluorescent lamps can also now achieve up to 60,000 hours of lamp life, reducing maintenance costs with less need to replace lamps (or relamping). It should be noted that the lamp-life rating system for fluorescent lamps is the hour when 50 percent of the lamps fail. In other words, 50 percent of the lamps would need to be changed during the rated life of the fluorescent fi xture. While high-efficiency linear fluorescent lamps are inexpensive (especially when compared to their LED counterparts), lamp-life and mortality rates are a prime disadvantage when compared to LED light sources. PHOTO © MDR PHOTOGRAPHY NAVIGATING THROUGH NEW LIGHTING CHOICES PHOTO © BOORA ARCHITECTS Among the differences between fluorescent and LED lighting sources are the different lamp-life rating systems. The LED life rating is determined when the LED light output (or lumen) falls below a set percentage of the original light output. For example, a 100,000-hour "L/90" rated LED will maintain 90 percent of the original light output at the end of the 100,000 hours. (Note that LED lamp failure rate is also very small; almost none after the initial six months.) LED manufacturers use different life-rating systems though, which make comparisons of lamp-life somewhat difficult. In general, however, a college or university can expect to replace only five to 10 percent of its 100,000-hour LED lamps. Today, a number of major manufacturers are marketing 100,000-hour L/90 LED lamps with a 10-year warranty. For classroom and office use, assuming a COLLEGE PLANNING & MANAGEMENT / DECEMBER 2012 WORTH EVERY PENNY. LED technology has rapidly evolved beyond basic applications for signage, accent, and display lighting. LED systems are enabled by advanced optical designs and materials to deliver superior, energysaving solutions in educational spaces that present challenging visual tasks, sustained over extended periods of time. LEDs have crossed a significant threshold — now becoming a viable alternative for general illumination of interior applications. 50-hour/week usage, 100,000 hours of lamp life translates into 38.5 years of life for the fi xture, making the need to relamp for these spaces almost unnecessary. The long life and low rate of failure for LED fi xtures are the principal reasons for colleges and universities around the country to replace their interior lights with LED fi xtures, reducing the need to stock lamps and the staff necessary to check and replace lamps. Even in spaces where light is left on continuously, such as corridors, the 100,000 hours in a LED lamp translates into 11.5 years of service before replacement, saving two lamp changes compared to a typical standard 30,000-hour linear fluorescent, or nine WWW.PLANNING 4EDUCATION.COM

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