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Is it true that it is cheaper to leave lights on than to turn them on and off several times during the day?

This is not correct. There is not a higher energy requirement for starting lamps that outweighs running them for any period of time. Although shorter burning cycles [more "on and offs"] can reduce lamp life, it is always better to turn lights off when they are not in use. Since the cost of the electricity [even in the cheapest markets] is so much more that the cost of replacing lamps a little sooner, you would maximize your savings by turning off the lamps when you don't need the light.

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