Discharge lamp lighting device and illumination fixture

摘要

[Object] To provide a discharge lamp lighting device and an illumination fixture which can set a duration time of an electrode heating operation to a suitable length for each discharge lamp. [Means for Settlement] There are provided a symmetry determining part 2 for determining whether or not a lamp current outputted to a discharge lamp La is in a positive-negative symmetrical state and a control part 3 for controlling power outputted to the discharge lamp La. After a starting operation for starting discharge in the discharge lamp La, the control part 3 performs an electrode heating operation for heating an electrode of the discharge lamp La and then, shifts the electrode heating operation to a steady operation for maintaining lighting of the discharge lamp La by a rectangular wave AC power. When the symmetry determining part 2 determines that the lamp current is in a positive-negative symmetrical state in the electrode heating operation, the control part 3 shifts the electrode heating operation to the steady operation.