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Redesign of Lighting Fixtures for the Texas Department of Corrections
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Over 100 tests of potential design modifications for the cell light fixtures used by the Texas Department of Corrections have been conducted. As a result of these tests, the following recommendations are made: 1. Turn diffuser material so prisms face cell. 2. Enlarge diffuser opening to 16 by 46 inches. 3. Replace 1/2-inch hardware cloth by #3 stainless cane weave with 2-inch mesh, painted white. 4. Replace ballasts with Advance R-2S40-TP Mark III or equivalent. 5. Replace blankets with light colored blankets. 6a. Use fixture with four 34 watt tubes if no allowance for fixture degradation is deemed acceptable; 6b. Use fixture with three 40 watt high efficiency tubes and reflector if 10%-15% margin above 20 fc is needed; 6c. Use fixture with four high efficiency tubes if 20% margin above 20 fc is considered necessary.
DescriptionImplementation of these recommendations will result in reduced construction cost of $91,418 and annual operating savings of $88,910 if recommendations 1-5 and 6a are implemented at Amarillo and Gatesville. Use of recommendations 1-5 and 6b will increase first cost by $22,592, but annual operating savings also increase to $98,928 while 6c would provide first cost savings of $67,606 and operating savings of $73,882 annually. Additional maintenance savings will be realized in each case since the fixtures recommended above use tubes with 20,000 - 24,000 hour operating lifetimes instead of the 12,000 hours of the base case tubes.
SubjectTexas Department of Corrections
Claridge, D. E.; Turner, W. D.; Krarti, M.; Yebra, R. (1988). Redesign of Lighting Fixtures for the Texas Department of Corrections. Energy Systems Laboratory (http://esl.tamu.edu), Texas A&M University; Department of Mechanical Engineering, Texas A&M University. Available electronically from