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Old 07-12-2016, 10:47 AM
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Join Date: Nov 2000
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Mythbusters did that as a MiniMyth.

Summary
Quote:
The answer is…according to the MythBusters show: "Yes there is a spike when you flip the switch on but it is in no way significant enough to be considered money saving to leave your lights on for a few minutes while you leave the room. So it is best to turn off your lights even for a few minutes, than to leave them running fearing the spike in energy and a spike in your electricity bill. Also if you were to use energy saving bulbs in the bathroom and were constantly flicking them on and off you would have to replace them sooner and in the end you be paying more for the bulbs than your month's electric bill."