Abstract
The two primary performance metrics of any lamp-ballast system are lamp life and lumen depreciation. Lamp life for a particular lighting application is easily quantifiable, relying only upon the retention of maintenance records. However, the study of lamp lumen depreciation is more challenging in that lamps must be removed from installation throughout their life-cycle to allow for an accurate measurement of luminous output. In May of 1998 the lighting of the Rector Field House, located on the campus of Virginia Tech, was replaced. This upgrade was performed to not only improve lighting quality within the facility, but to also study the effects of ballast type upon the two key performance metrics, lamp life and lumen maintenance. Results of this evaluation, which concluded in May of 2002, are presented accompanied by a discussion of the factors affecting the results.
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