Is it cheaper to leave a light burning for several hours than to turn it off and on several times?

This used to be a valid question with older fluorescent fixtures, but not anymore. A light that is off doesn't use power and it doesn't use extra power when turning on, so turn it off to save power Answer It depends what you want to consider. If you throw bulb life into the mix (most bulbs fail due to thermal cycle fatigue) then you might be better off leaving the light on Answer Incandescent lamps have substantially higher inrush current before the filament heats up.

This probably does not amount to enough to significantly increase the operating cost, however it reduces the life of the bulb. Incandescent light failure is almost always when cycling the lamp on.

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