Functionally testing lamp circuit involves measuring current and voltage and taking into account resistance defined as polynomial of at least the first order depending on voltage currently measured on lamp circuit

摘要

The method involves measuring current and voltage and taking into account a resistance that is defined as a polynomial of at least the first order depending on the voltage currently measured on the lamp circuit. The parameters of the polynomial are determined with a number of measurements corresponding to the order of the polynomial under known varying operating conditions and the resistance value or a derived parameter is compared with a defined value. An independent claim is also included for an illumination system.