The J.N. Desmarais Library had been experiencing huge amounts of waste in lighting consumption. Part of the problem was due to the use of inefficient lamps and ballasts. However, a major cause of the prob- lem was due to lighting for the entire library being left on from the time the library opened at 7 am until the cleaning personnel completed their rounds at 1 am. During these hours, many areas within the library were unoccupied for great len

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