| 摘要 |
An illuminating lamp (100) connectable to commercial electric power (E) or a fluorescent lamp ballast (203) includes a semiconductor light emitting element (160), multiple lighting circuits (110, 120, 130) each capable of turning on the semiconductor light emitting element (160), a switching circuit (140) that switches connection between at least one of the multiple lighting circuits (110, 120, 130) and the semiconductor light emitting element (160), and a controller (150) that switches the switching circuit (140) in accordance with a predetermined condition, selects one lighting circuit (110, 120, 130) among the multiple lighting circuits (110, 120, 130), and turns on the semiconductor light emitting element (160) using the selected lighting circuit (110, 120, 130). |
