This SAE Recommended Practice applies to motor vehide Forvvard Illumination Systems which use light generated by discharge sources. It provides test methods@ requiremeMs@ and guidelines applicable to the special characte~istics of gaseous discharge lighting devices which supplement those required for forward Gluminatlon systems using incandescent light sources. This document is intended to be a guide to standard practice and is subject to change to reflect addftional experience and technical advances.