| 摘要 |
PROBLEM TO BE SOLVED: To change light output finely by improving the response speed of the light output to a signal. SOLUTION: The discharge lamp lighting device 1 connected to a telecommunication cable Ls of a system (DALI system) is structured with a discharge lamp 11, an inverter 12, a microcomputer 13, a PWM/DC converter 14, an oscillator 15, and an output detecting part 16. The microcomputer 13 switches the frequency of a PWM signal in correspondence with the type (dimmer width) of the inverter 12 connected to itself, and raises the higher the frequency of the PWM signal, the narrower, for instance, the dimmer range of the connected inverter 12 is. |
