When hooking up a potentiometer, use the Dim + and Dim - wires on the driver (grey and purple) and solder them to the 1 and 2 or 2 and 3 prongs on the potentiometer. It doesn't matter which prongs (1,2 or 2,3).
We have received many questions about the difference between the HLG 600H and the HLG 550 V2. The main differences are listed below.
HLG 550 V2 R-Spec