The Mean Well HLG-320H-C2100B is a 320W high efficiency AC-DC constant current LED driver with a built-in active PFC function. It is built around a single-stage PFC circuit composed of a PFC controller, a boost diode and a power switch. The driver features built-in over-voltage, over-temperature, and short circuit protection, as well as a universal AC input voltage range of 85-265VAC. The adjustable output voltage range is 15-54V, and the adjustable constant current range is 450-2100mA. The unit also features a power factor of >0.95 and high efficiency of up to 90.5%. The unit is rated for adjustment of output voltage by internal potentiometer and remote control.