Switching Lights on and off Uses More Energy than leaving them on, doesn’t it?
No, not really. Low energy bulbs do use more power when they come on, but it’s only equivalent to a minute or two of actual running time. Switching them on, off and back on again in quick succession may shorten their lives – but if you’re going to be away for more than a quarter of an hour or so, turning them off is the best thing to do.