| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a lighting circuit and lighting method for a high-pressure discharge lamp capable of avoiding great reduction in illuminance maintenance rate by reducing variation in inter-electrode distance at the beginning of usage without modulating a lighting frequency.SOLUTION: In a lighting circuit 10 for supplying an AC lamp current Ato a high-pressure discharge lamp 28 to lighten the high-pressure discharge lamp 28, the lamp current Ahaving at least one pulse current Ain a first half of each half cycle and having at least two pulse currents Aand Ain a second half of each half cycle is supplied.</p> |
