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Selling high-bay lighting control projects on an energy-savings basis has traditionally been difficult to do. One reason is that utility payments and project funding come out of different budgets. Another is that energy savings does not translate into increased output. It does, however, translate into lower per unit cost.
Relamping interval recommendations are typically expressed in hours of operation at full output. After X number of hours of operation, the lamp’s output starts to sharply decline. Replacing lamps at this point will best balance light output against cost.
You can significantly extend the relamping interval through a combination of automatic dimming and on/off operation. Consider a combination of photo sensors, occupancy sensors, and timers. For example:
As the last two of these examples show, a good control scheme may combine control methods.