| 摘要 |
<P>PROBLEM TO BE SOLVED: To perform lighting control of a first light source according to one lighting control signal, and unlight the first light source reliably and light a second light source reliably when the signal value of the lighting control signal reaches a specified value. <P>SOLUTION: In the lighting device 40 of a luminaire 10, when the duty ratio of a lighting control signal input by a lighting control signal detection circuit 70 is less than a threshold D1, a first lighting control unit 61 lights a first light source LA1 with a smaller light output as a duty ratio of the lighting control signal is larger, and a second lighting control unit 62 unlights a second light source LA2. When the duty ratio of the lighting control signal is equal to or larger than D1, the first lighting control unit 61 unlights the first light source LA1, and the second lighting control unit 62 lights the second light source LA2 with a smaller light output as a duty ratio of the lighting control signal is larger. <P>COPYRIGHT: (C)2012,JPO&INPIT |
