Using a dimming switch on an incandescent light bulb will not only reduce the energy consumption of the lamp, but also it will extend the life of the lamp. A 10% reduction in voltage [12 volts] in a lamp designed for 120-volt operation will extend the life almost 400%. However, light output will be reduced. For example, if you use a 100-watt standard household incandescent dimmed by 10%, you'll save 10% energy, extend the life of the lamp, but the light bulb would have a diminished light output.

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