DISCHARGE LAMP LIGHTING DEVICE AND LUMINARIES

摘要

A minimum lamp voltage detection means which is equipped with one output power characteristic curve for supplying a constant power for the rated lamp voltage range of a discharge lamp and with a plurality of output power characteristic curves (W1, W2, W3) for a lamp voltage up to the rated lamp voltage range, and which detects a minimum lamp voltage after transition to arc discharge when lamp power is supplied to a high pressure discharge lamp based on an initially set output power characteristic curve after the high pressure discharge lamp is started is provided. The larger the minimum lamp voltage detected by the minimum lamp voltage detection means with in a predetermined minimum lamp voltage range, the larger output power characteristic curve is reset from the plurality of output power characteristic curves (W1, W2, W3), and then subsequent power control is performed.