Discharge lamp lighting device and illumination fixture

摘要

[Object] To provide a discharge lamp lighting device and an illumination fixture in which an output current to a discharge lamp in shifting to a steady operation can be provided in a positive-negative symmetrical state while suppressing a duration time of an electrode heating operation to be relatively short. [Means for Settlement] There are provided a control part 3 for performing, at start of a discharge lamp La, after performing a starting operation to start discharge in the discharge lamp La and before starting a steady operation to output rectangular wave AC power for maintaining lighting to the discharge lamp La, an electrode heating operation of heating electrodes of the discharge lamp La by making a frequency of AC power outputted to the discharge lamp La higher than a frequency in the steady operation, and a half-wave discharge detecting part 2 for detecting half-wave discharge in the discharge lamp La. When the half-wave discharge detecting part 2 detects half-wave discharge in the electrode heating operation, the control part 3 performs a half-wave discharge improving process which resolves half-wave discharge by making a small peak value as a lower peak value out of peak values of both polarities of a current outputted to the discharge lamp La larger.