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A room or office with sunlight coming through the windows may not need all its lights on at 100% power throughout the day. Using a ballast or other control mechanisms to moderate lighting near windows allows artificial lights and sunlight to be used together in the most efficient way possible. A ballast enables light dimming that responds to actual demand. Light sensors are another effective option: they detect ambient light in the area and dim lights through the ballast as necessary.
Lighting control mechanisms save energy and can lower electric bills. Actual savings can vary depending on the amount of natural sunlight in the region, the type of windows a building has, the building’s typical occupancy schedule, and other factors such as electricity rates and light sensor settings.