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With several lights in series across the power source, the full voltage of the power source

is divided among the group of lights, in proportion to the resistance of each one, and the

power available to each light depends on all of the others. The more lights in the series

circuit, the less voltage each one gets, and the less power each can dissipate as light.

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Another contributor added:

Furthermore, power = voltage times current, and Current is equal to voltage divided by resistance. Putting lights in series increases the circuits resistance, which lowers the current, thus decreases power. This is why the overall light output of two lights in series will be less than a single light.

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