Arrangement in connection with discharge lamp

摘要

An arrangement in connection with a discharge lamp, the arrangement comprising an electronic ballast for igniting and burning the discharge lamp (4), and a voltage control device arranged to modify supply voltage of the ballast. The voltage control device is further arranged to include a power control signal in the supply voltage. The arrangement further comprises a power filter (2) and a control filter (1) for separating the power control signal (p) from the supply voltage (Uin), the ballast being responsive to the power control signal (p) in order to control the level of light of a fluorescent tube (4).