High pressure discharge lamp apparatus.

摘要

In a high pressure discharge lamp apparatus comprising a discharge tube (3) and a current limiting device (2) connected in series, an over-current protecting semiconductor switching device such as a triack (TC) is further connected in series to said discharge tube (3), the triack (TC) being controlled of its firing angle responding to an output of a current detection circuit (9) which detects a change of the lamp current through a change of the lamp voltage, and a pulse generator (4) is further connected in parallel to the discharge tube (3) and gives reignition pulse thereto at least during the zero-current period in each cycle of the lamp current.