Discharge lamp lighting device and illumination fixture

摘要

[Object] A plurality of lamps having compatible electrical characteristics and considerably different rated power can be lit by using a common lighting device. [Means for Settlement] In a discharge lamp lighting device capable of lighting plural types of discharge lamps with different recommended conditions of precedent preheating for filament and determining the type of a discharge lamp by detecting a voltage at both ends of the filament within a period of precedent preheating time, a higher current value included in the recommended conditions is used for a preheating current in the detection and an output is set to be applicable to rated power of a determined discharge lamp. A preheating current in the detection is also set to generate a discharge between electrodes in the periphery of a filament within a period of precedent preheating time if a discharge lamp with lower criteria of the recommended conditions is fitted.