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Pre-Retrofit Lighting Study at the University of Texas at Arlington, Texas
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As a part of the Energy Cost Reduction Measure (ECRM) retrofit program, funded by LoanSTAR, the U.T. Arlington site was granted a $2 million loan to implement an energy-saving lighting retrofit in 20 classroom buildings on the campus. The original Audit Report for the site, completed in 1991, recommended a lighting retrofit that included delamping, relamping with high efficiency lamps, the installation of high efficiency electronic ballasts, and the installation of specular reflectors. However, if the retrofit could be implemented without the use of specular reflectors, then a considerable amount of investment capital would be saved.
DescriptionIn the summer of 1993 the UTA Physical Plant Department submitted a request to the Energy Systems Lab to conduct a lighting study to determine the most cost-effective method of implementing energy-saving lighting retrofits in U.T. Arlington classrooms without compromising the Illuminating Engineering Society (IES) recommended minimum lighting levels of 50-75-100 footcandles. UTA requested a comparison of various combinations of lamp quantities, lumen output, and lamp spacings to determine the most efficient footcandle levels from 2ft x 4ft, four-lamp fixtures that have had two lamps removed. The present study begins with a review of the ECRM Audit Report for the U.T. Arlington site. The results of lighting fixture tests, as presented in the pre-retrofit Audit Report, determined that a postretrofit lighting level of 78% of the existing level was required in order to meet the IES minimum of 50-75-100 footcandles, as reported in the 1993 Lighting Handbook: Reference and Application. 8th Edition, published by the IESNA in 1993. A survey was also made of various lamp and ballast combinations available in the marketplace, with respect to light output and efficiency, in order to identify those which comply with Federal laws enacted to save energy.
Houcek, J. K.; Claridge, D. E.; Haberl, J. S. (1993). Pre-Retrofit Lighting Study at the University of Texas at Arlington, Texas. Energy Systems Laboratory (http://esl.tamu.edu), Texas A&M University; Department of Mechanical Engineering, Texas A&M University. Available electronically from