First off all of my projectors are bi-xenon. So hid lows and highs.
I wired my acura tl hid ballasts to my low beam circuit. I wired my mini h1 ballasts to my fog circuit so I can use them independent from each other. And I wired all 4 high beam solenoids on the projectors to my high beam circuit.
On a bi-xenon projector it uses a single bulb for high and low beam. It has a solenoid that flips a shield down for high beam. So if your lights are on, and you hit your highs, instant hid high beam instead of waiting for the bulb to warm up like if you had hids in your high beam reflector