DISCHARGE LAMP

摘要

PHN 8522 17.7.1977 : The invention relates to a discharge lamp intended for operation with alternating current, wherein the lamp is provided with an internal capacitor. According to the invention the capacitor is a temperature-dependent capacitor which is either in series with the discharge tube or is included in a branch which is in parallel with that discharge tube. The result is that at the relatively low lamp temperature at the beginning of the starting procedure of that lamp the capacitance of the capacitor is relatively high and that in the operating condition of the lamp the capacitance of the capacitor is relatively low. In the case where the capacitor constitutes a ballast of the lamp (series arrangement) this results in an increased starting current of the discharge tube. In the case the capacitor shunts the discharge path a proper operation of the capacitor, which promotes starting, can be coupled to a situation in which the capacitor in the operating condition of the lamp is hardly of any influence any longer.