| 摘要 |
A method for dimming a gas discharge lamp, such as an HID lamp including an MH lamp, includes operating the lamp at nominal power with commutating DC current having a current magnitude I<SUB>L</SUB>=alphaI<SUB>nom</SUB>, alpha being equal to 1 or less than 1. The current magnitude I<SUB>L </SUB>is reduced, but the lamp still is operated at commutating DC current, until alpha reaches a predetermined value beta. Then, the lamp is operated at DC current, and the current magnitude is reduced further, thus achieving a lower dimming level. |
