| 摘要 |
A method and an arrangement in connection with a control gear arranged to control two parallel-connected fluorescent tubes, and a control gear, whereb y the parallel-connected fluorescent tubes are fed using a single control gear in common, which comprises control means arranged to provide output current for the control gear in response to a current reference. The method comprise s controlling the control gear to provide output current having a first magnitude, determining continuously the working condition of the fluorescent tubes con- nected to the control gear, controlling the output current of the control ge ar to be divided substantially evenly between both fluorescent tubes, when said tubes are in working condition, detecting a change in the working condition of one or both of the tubes to be fed, changing the output current of the contr ol gear to a second magnitude of the output current in response to the change detected in the working condition, and controlling the control gear to provi de output current having the second magnitude.
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