Method for determining operational parameters of gas discharge lamp operated with electronic ballast, involves determining cold resistance and hot resistance of helices at two different times during preheating phase

摘要

The method involves determining cold resistance and hot resistance of helices (W1,W2) at two different times during a preheating phase. The heating power or the heating current is kept constant or alternatively, and a predetermined heating power or a predetermined heating current is set at the beginning of the preheating phase. An independent claim is included for a ballast for a gas discharge lamp.