In this paper，in order to establish an effective lighting control under a situation of demand response，we propose a lighting control method. The proposed method controls a dimming pattern in a floor to be able to maintain target electric power. In addition，it controls to minimize a illuminance reduction felt by people. To achieve such controls，the proposed method has a function that gives a brightness to only around people in a floor，a function to determine a target illuminance considering a preference of brightness for each people，and a function to determine dimming rates pattern in a floor by adjusting target illuminance for each people in order to satisfy a target electric power. In this paper，we describe implementation methods of these functions and simulation results，and we show that it is an effective lighting control method under the situation of demand response.

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