Describes the procedures to be followed and the precautions to be taken in measuring performance of LED drivers. The scope includes, but is not limited to, LED drivers with these characteristics:General lighting, exterior lighting, and roadway lighting applicationsInput supply voltage up to 600 VDC or 600 VAC (50 or 60 Hz)Output open-circuit voltage of 600 V or lessConstant-current or constant-voltage DC outputFixed, variable (dimmable), pulse width modulation, or programmable (tunable) output powerExternal (standalone) or internal (enclosed in luminaire)