Abstract: The lighting control device according to the present invention includes: a power supply for operating a light source including a first light source and a second light source lower in color temperature than the first light source; and a controller for controlling the power supply. The power supply includes: a first power supply for supplying power in a first range to the first light source; and a second power supply for supplying power in a second range to the second light source. The controller controls the first and second power supplies to adjust power supplied to the first light source and power supplied to the second light source so that a color temperature of the light source is equal to a color temperature which is selected from a predetermined color adjustment range as a desired value. The first range is lower in a lower limit than the second range.

Abstract: A lighting device includes a switching circuit configured to supply a supply voltage to each of a plurality of light sources by time division. The lighting device includes a variable control circuit configured to supply a continuous DC supply voltage to each of the light sources. The lighting device includes a controller. The controller includes a first control function of controlling the switching circuit. The controller includes a second control function of controlling the variable control circuit. The controller is configured to select either the first control function or the second control function for each of the light sources.

Abstract: A lighting device includes a switching circuit configured to supply a supply voltage to each of a plurality of light sources by time division. The lighting device includes a variable control circuit configured to supply a continuous DC supply voltage to each of the light sources. The lighting device includes a controller. The controller includes a first control function of controlling the switching circuit. The controller includes a second control function of controlling the variable control circuit. The controller is configured to select either the first control function or the second control function for each of the light sources.

Abstract: When supplying an LED light source with a first output voltage that is equal to or higher than a threshold voltage, an LED driver causes a DC power supply to output a first DC voltage and causes a switching regulator to supply the LED light source with the first output voltage. When supplying the LED light source with a second output voltage that is below the threshold voltage, the LED driver causes the DC power supply to output a second DC voltage lower than the first DC voltage and causes the dropper regulator to supply the LED light source with the second output voltage.

Abstract: A lighting device includes at least first and second lighting circuits configured to receive electric power from a single common DC power supply. First lighting circuit includes a first output capacitor connected between output ends thereof, and a first pre-charge circuit configured to keep a voltage across first output capacitor at a first voltage for first lighting circuit, while a first light source is in OFF state. Second lighting circuit includes a second output capacitor connected between output ends thereof; and a second pre-charge circuit configured to keep a voltage across second output capacitor at a second voltage for second lighting circuit, while a second light source is in OFF state. First and second voltages are set such that a difference between a forward voltage of first light source and the first voltage agrees with a difference between a forward voltage of second light source and the second voltage.

Abstract: When supplying an LED light source with a first output voltage that is equal to or higher than a threshold voltage, an LED driver causes a DC power supply to output a first DC voltage and causes a switching regulator to supply the LED light source with the first output voltage. When supplying the LED light source with a second output voltage that is below the threshold voltage, the LED driver causes the DC power supply to output a second DC voltage lower than the first DC voltage and causes the dropper regulator to supply the LED light source with the second output voltage.

Abstract: A lighting device includes at least first and second lighting circuits configured to receive electric power from a single common DC power supply. First lighting circuit includes a first output capacitor connected between output ends thereof, and a first pre-charge circuit configured to keep a voltage across first output capacitor at a first voltage for first lighting circuit, while a first light source is in OFF state. Second lighting circuit includes a second output capacitor connected between output ends thereof, and a second pre-charge circuit configured to keep a voltage across second output capacitor at a second voltage for second lighting circuit, while a second light source is in OFF state. First and second voltages are set such that a difference between a forward voltage of first light source and the first voltage agrees with a difference between a forward voltage of second light source and the second voltage.

Abstract: The lighting control device according to the present invention includes: a power supply for operating a light source including a first light source and a second light source lower in color temperature than the first light source; and a controller for controlling the power supply. The power supply includes: a first power supply for supplying power in a first range to the first light source; and a second power supply for supplying power in a second range to the second light source. The controller controls the first and second power supplies to adjust power supplied to the first light source and power supplied to the second light source so that a color temperature of the light source is equal to a color temperature which is selected from a predetermined color adjustment range as a desired value. The first range is lower in a lower limit than the second range.