PROBLEM TO BE SOLVED: To enhance the efficiency of discharge lamp replacement work including work for manually resetting an accumulated lighting time of the discharge lamp, in a discharge lamp lighting system adjusting the illuminance of the discharge lamp in accordance with the accumulated lighting time of the lamp.;SOLUTION: A power source resetting determination circuit 184 (a lighting pattern determination part) determines that a power source switch SW1 is put on in the case that a lamp lighting detection circuit 170 detects the lighting of a lamp 200 (a discharge lamp). The power source resetting determination circuit 184 determines that a resetting operation is performed in the case the power source switch 1 is operated in accordance with a preset resetting pattern, and a memory resetting signal generating circuit 185 generates a resetting signal. A lighting timer counter 181 (an accumulated lighting time measurement part) and an added-up lighting time memory 182 (an added-up time memory part) reset an accumulated lighting time when the reset signal is inputted.;COPYRIGHT: (C)2007,JPO&INPIT
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