Abstract:
A luminaire includes: a light source configured to emit light in a plurality of different colors; a controller that controls a color of the light emitted by the light source; an operation panel that receives information indicating a second color of light to be emitted by the light source; and an obtainer that obtains from an external device first information indicating a first color of light to be emitted by the light source. The controller stores second information including the information indicating the second color of light to be emitted by the light source, received by the operation panel. The controller generates third information indicating a third color which is a mixture of the first color of light indicated by the first information and the second color of light indicated by the information included in the second information, and causes the light source to emit light using the third information.
Abstract:
A dimming control device configured to receive dimming input level data updated at intervals, and to control a dimming level of a light source based on the dimming input level data, includes: a memory that stores the diming input level data received prior to the newest dimming input level data; and a generator that generates dimming output level data as data having higher resolution than the dimming input level data, the dimming output level data being generated as a function of the dimming input level data received and stored in the memory.
Abstract:
A constant current is configured to control an FET to adjust a drain current so that a detection voltage is equal to a reference voltage. A reference setter is configured to set the reference voltage to a sum of a first voltage and a second voltage. The first voltage is equal to a voltage developing across the detection resistor while a current, which has a same magnitude as a current supplied to the light source so that a current dimming level of the light source is equal to the dimming instruction value, flows through the detection resistor. The second voltage is equal to a voltage developing across the detection resistor while a second current, which has a same magnitude as a current flowing through the limiting resistor while the light source is on, flows through the detection resistor.
Abstract:
A lighting control device that controls lighting fixtures includes: a command generator that generates one or more commands for controlling the lighting fixtures; a signal transceiver that communicates with the lighting fixtures; and a communication protocol setter that sets which one of two or more types of communication protocols is to be used. The two or more types of communication protocols include a first communication protocol. The signal transceiver simultaneously transmits, using the first communication protocol, a first command to each of the lighting fixtures. The first command is included in the one or more commands and requests a response. The communication protocol setter sets the first communication protocol as the communication protocol to be used for one or more of the lighting fixtures that have responded to the first command.
Abstract:
A luminaire includes: a light source configured to emit light in a plurality of different colors; a controller that controls the color of the light emitted by the light source; and a plurality of buttons that correspond one-to-one with the plurality of different colors and are operated by a user to cause the light source to emit light. Each time one of the buttons is operated, the controller stores a control parameter associating the color corresponding to the button operated with a sequence value indicating a sequential order in which the button is selected. The controller changes the color of the light emitted by the light source in accordance with the colors and the sequential order indicated in the stored control parameter.
Abstract:
The lighting device includes a control unit configured to set desired values of drive currents of solid state light sources with different light emission colors. The control unit has a normal mode and a correction mode. The normal mode is a mode of setting the desired values to normal desired values corresponding to instruction values representing a desired color of colors. The correction mode is a mode of setting the desired values to corrected desired values corresponding to corrected instruction values obtained by correcting the instruction values.
Abstract:
The lighting device includes a controller for determining first, second, and third desired values of first, second, third drive currents to first, second, and third light sources, based on a correction coefficient for correcting chromaticity points of the first, second, and third light sources to first, second, and third chromaticity points. The first, second, and third light sources have first, second, and third ranges of individual differences in color. The first chromaticity point is an intersection of a straight line touching the first and second ranges and another straight line touching the first and third ranges. The second chromaticity point is an intersection of a straight line touching the second and first ranges and another straight line touching the second and third ranges. The third chromaticity point is an intersection of a straight line touching the third and first ranges and another straight line touching the third and second ranges.
Abstract:
A lighting device includes: a variable voltage source; a transistor which controls a current flowing through a light-emitting element; and a control circuit which causes the transistor to pass a current corresponding to a received instruction for a dimming level through the light-emitting element. When the received instruction instructs at least a predetermined dimming Level, the control circuit causes a voltage drop in the transistor to become a first voltage by controlling the variable voltage source, and when the received instruction instructs a dimming level less than the predetermined dimming level, the control circuit causes the voltage drop to become a second voltage higher than the first voltage, by controlling the variable voltage source.
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.