| 摘要 |
PROBLEM TO BE SOLVED: To suppress power consumption in a lighting fixture where a plurality of light sources having luminous colors different from each other, and voltage drop values different from each other when currents of the same value flow are lighted.SOLUTION: A lighting fixture 10 includes LEDs 3, 4, 5 having luminous colors different from each other, and voltage drop values different from each other, switches Q3, Q4, Q5, a DC voltage conversion circuit 103, and a control circuit 106. The control circuit 106 performs time-sharing control of the switches Q3, Q4, Q5, and performs first control for turning them on/off in a state where the on periods do not overlap. Furthermore, the control circuit 106 performs second control for adjusting the ratio in the LEDs 3, 4, 5 of the product of a target current value and a target length of the on period, by individually controlling the target current values to be fed to the LEDs 3, 4, 5 during on period of the switches Q3, Q4, Q5, and/or the target length of on period of the switches Q3, Q4, Q5. |
