Wroclaw_666: Enegry-save bulbs need to big energy to start and to get warm enough to operate cost-effective as far as I know.
its only going to be an issue if you switch on and off for a few seconds. Big energy is relative; still not as much as a normal lightbulb operating
Based on the amount of energy consumed turning on the bulb, they were able calculated how long the bulb would have to be turned off in order to make it worth the energy savings, i.e. "It's best to turn off the bulb if you are leaving the room for":
Incandescent: 0.36 seconds CFL: 0.015 seconds Halogen: .51 seconds LED: 1.28 seconds Fluorescent: 23.3 seconds
In other words, its almost always best to turn the bulb off. Even the 23 seconds for the fluorescent lights isn't very long, and the rest of the times are pretty much blinks of an eye.
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