Patent ID: 8384296
Filing Date: 2013-02-26
Classification: G03B,H05B,Y02B

Abstract:
1. A high pressure discharge lamp lighting apparatus comprising: a high pressure discharge lamp comprising: an electric discharge silica glass container enclosing 0.2 mg/mm a power supply apparatus that supplies a rectangle wave alternating current to the high pressure discharge lamp for lighting; wherein when the lamp is operated by electric power of 0.5×P (W) or less, when maximum operation power P (W) in a steady lighting state except an initial lighting period that is immediately after starting, where a first polarity driving period of a rectangle wave alternating current is Ta (seconds) and a second polarity driving period is Tb (seconds), an operation is performed so that the second polarity driving period Tb is 5 ms or less (Tb≦5 ms) and a ratio Tb/Ta of these two driving periods is 0.1 or less (Tb/Ta≦0.1).