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Leaving the lamps on 24/7 uses more energy than turning them on only when needed. It is equally true to say: A) It is not a myth that leaving incandescent filament lamps on 24/7, rather than switching them off and on when needed, uses more energy and is therefore worse for the environment. B) Using incandescent filament lamps instead of compact fluorescent lamps always uses more energy and is therefore worse for the environment. This remains true whether they are left on 24/7 or switched on and off when needed. If you switch the light off and on once each minute (or less), then there might be a case for leaving them on. Not only will they last longer, but the power lost to get them up to temperature will be reduced.

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