Patent ID: 8342695
Filing Date: 2013-01-01
Classification: G03B,H05B,Y02B

Abstract:
1. A high pressure discharge lamp lighting apparatus, comprising: a high pressure discharge lamp comprising: a power supply apparatus that supplies a rectangle wave alternating current to the high pressure discharge lamp, wherein the high pressure discharge lamp has a steady power lighting mode and a low power lighting mode, wherein the discharge lamp is driven by an alternating current in the steady power lighting mode in which a first polarity and a second polarity are repeated by turns at a regular electric power lighting frequency selected from a range of 100 Hz-5 kHz, wherein the high pressure discharge lamp is driven at 50% or less of the alternating current in the low power lighting mode, wherein the alternating current comprises a first time unit and a second time unit that are repeated by turns so as to drive the discharge lamp, wherein the first time unit has a time width t wherein the second time unit has a time width t