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This depends on the type of light source (incandescent, fluorescent, HID...etc) and the size of circuit breaker used. But for 400Watt, the rated current is obviously small (about 2 Amps) and you can use the smallest circuit breaker size and wire you have (typically 10A C.B. with 1.5 mm2 wire, 15A with 2.5mm2).

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