| 摘要 |
The purpose of the invention is to prevent an occurrence of high voltage when a lamp 10 is not yet attached in a more reliable manner. In this invention, there is a provision of switch means 70 for turning on/off an electrical connection between a ballast chock 50 and a power source 60 at a portion of a lamp socket 20. There is also a provision of delay means for preventing a generation of spark between the lamp 10 and a high voltage contact member 216 on the side of the lamp socket 20.
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