HLG-40H-20B class 2 power supply to a 24 LED 's (stage) light and regular power extension
The type B, on one end you have one cable with three conductors, Brown Blue and Green, The Blue (Neutral) and Brown (Live) is your AC power input, and the Green is the ground.  

The Red(+) and Black(-) on the other end go to the LEDs.

The Blue and White are the dimmer wires, if you want full 2 Amp to go to the LEDs, then leave the Blue and White open. 



That being a 20V driver, how are the LEDs laid out?  However they are wired, I think you may have a problem. Seeing they cannot be in series, there must be some in parallel if a 20V driver is going to light them up.  At that current any parallel strings will be unbalanced, getting different amount of current where thermal runaway could be an issue. 

If the parallel strings eachj have a current linmitng resistor, that will not help, and the resistors will only waste power.