[johnwalkr]

High also refers to the lack of beam cut-off or masking[1], not only the intensity. In UK English, the terms are "full beam" and "dipped beam" to reflect this.

[1] For older US cars, it was more about intensity as the masking sucked. I don't think it's that relevant to this discussion but you can look up "DOT vs Euro headlights" if it interests you.