Suggest that you Create Your Signature with your equipment so that we can help you better. The IntelliConnect installation manual is linked below, you'll need to connect the LED light transformer to one of the two available relays to control them (page 5).
The standard relay has two input (line) pins and two output (load) pins... Normally, you'd use both line and load pins if the input were 240 volts where you had an L1 and L2 as inputs. You'd normally use one input and one output when using 120 VAC.. You could wire 120 volts to both inputs and this would give you 120 volts on each output, but they would both turn on and off at the same time, so no real reason to do it..
Do you already have you lights working and want to add more, or is the original light not working?