Consulting-Specifying Engineer - May 2008 - (Page 28) that true costs are the long-term lifecycle costs, not just the initial cost everyone often focuses on. Tips from the desert In 2007, Fay Herron Elementary School in North Las Vegas, Nev., completed a retrofit of its classrooms to improve both lighting and daylighting. When tasked with this project, the school district decided to approve two options: light sensors and tubular skylights. Classrooms had no natural sunlight, so engineers and lighting designers realized that by adding a lighting control product and allowing natural light into the classrooms, they’d save money and improve the quality of light. Each room was equipped with passive infrared sensors that measured the light level. If the room was occupied, lights Solar reflective tubes were installed with controls so that they could be either manually or automatically “dimmed.” would turn on and the skylights would open, based on the amount of light needed. Previously, each room was artificially lighted to 100 foot-candles; today each room is artificially lighted to 55 to 60 footcandles, cutting lighting requirements (and cost) in half. The tubular skylights were tuned to measure the outside light levels, and subsequently controlled the amount of sunlight they allowed in. Each classroom holds a control cabinet with a relay, control pad, and occupancy sensor. The controls can be overridden by the teacher, key to teaching with multimedia presentations or when extra light is needed for difficult tasks. In the case of Fay Herron Elementary, each room’s control system stands alone. Some schools, on the other hand, may decide that all classrooms should be on one main control system, or timers should turn lights on/off at specified times based on the time of year. The combination of both lighting controls and daylight offered a win-win situation for school officials and students. N EW ! Innovative Outdoor Emergency Lighting Powered by High-Output LED Technology The Dual-Lite PG Series provides advanced LED technology; unique reflector/lens design; minimum one-foot-candle egress path; wetlocation, cast-aluminum enclosure; and upscale styling in a single unit. It’s perfect for placement over any exterior entrance/exit or along perimeter walkways. Choose from three lightly textured powder-coat finishes. Spectron® self-testing/selfdiagnostic circuitry is included standard for performance reliability and ease of maintenance. Find out more from your local Hubbell Lighting, Inc. sales representative or visit www.dual-lite.com. Outdoor Emergency Lighting In Its Natural Habitat Let LED Power Work For You In Emergency Situations Input #214 at csemag.com/quickResponse 28 Consulting-Specifying Engineer • MAY 2008 http://www.dual-lite.com http://www.dual-lite.com http://csemag.com/quickResponse
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