In addition to a cleaner look, running the wires inside the bar also adds a significant level of protection. Maybe not a big deal...but certainly a bonus.
Don't be an ***, that wasn't what you were asking. That would be the only one run internally.
And you could run it outside the bars too, just pop it OUT AFTER the perch. But why would you?
dont be a D S ... its internally wired... you told the op something completely stupid.. and wrong.....