Can low and high beams be adjusted independently

Unfortunately the assembly is adjusted as a complete assembly.

I would suggest splitting the difference with the low and high beams. However, the high beams are supposed to be directed off into the distance and not necessarily at the road. You are to align the low beams so they are accurate and then the high beams are correct as well by default. However if it bothers you, adjust them slightly so you are happy with it. Just drive close to a wall or garage door so that the low beams appear on the wall so you can see how much you are adjusting them. Just remember, to adjust in small increments.

Let me know if you have questions. Thanks