| 摘要 |
PROBLEM TO BE SOLVED: To provide a luminaire having plural light sources that can suppress variation of operating current for the light sources even when at least one of a duty ratio and an operating current amount is different among lighting areas.SOLUTION: A lighting device has plural light sources, and control means for controlling at least one of the duty ratio of the turn-on period and the turn-out period of the light source and the operating current amount, and the turn-on phase of the light source for each area comprising one or plural light sources. The control means contains order determining means for determining the determination order of the turn-on phase of each area, and phase determining means which successively determines the turn-on phase of each area according to the determination order and determines the turn-on phase of the next area so as to suppress the total variation of the operating current amounts of light sources contained in areas whose turn-on phases have been determined in the interim and the next area.SELECTED DRAWING: Figure 8 |
