I just got my HLG-600H-54B and it has a wire that I'm not familiar with - RC+/RC-&GRD/+5Vsb - attached is the picture. I'm sure there are experts here that could give me a hand.
When you connect RC- and RC+ together, the driver will go into standby mode, ie turns off. Disconnect the RC wires and driver turns on light. The +5V can be used to power a timer, arduino, whatever. It's in the specs.
