To provide a lighting control system and a signal converter capable of controlling lighting at a high speed by means of a control signal matching an information network.

This lighting control system 1 is provided with a plurality of lighting control devices 4 controlling a lighting condition of a luminaire 5 on the basis of an inputted DMX signal, a light regulation device 2 capable of outputting the control signal for controlling the lighting condition of the luminaire 5, and the signal converter 3 converting the control signal outputted from the light regulation device 2 into a DMX signal and dividing the DMX signal channel into a plurality of transmission frames for outputting them to the previously set lighting control device 4.

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