The U.S. Department of Energy has indicated that the long-held belief that turning off lights saves money is flawed. The impact largely depends on the type of light bulb in use. Incandescent and halogen bulbs should be turned off when not in use due to their inefficiency. Conversely, CFLs are sensitive to frequent switching and should remain on for short absences. LED lights, however, are efficient whether on or off, with minimal cost savings realized from turning them off. The DOE also provides a calculator for assessing potential savings, though many may find it unnecessary.
The U.S. Department of Energy suggests that switching off lights may not save much money, especially with modern energy-efficient bulbs.
CFLs and LEDs have different optimal usage patterns, with LEDs being less affected by frequent switching and offering negligible cost differences.
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