R & D Electronics
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the correct numbers in the gray cells and press "Calculate".
For an explanation of the terms "Ballast Factor" and
"Coefficient of Utilization," you may click on the labels.
tool may be used to estimate the reduction (or increase) in light
levels when you replace lamps without changing the number of fixtures,
OR it can estimate the number of fixtures (with lamp B)
required to maintain the same average light level.