Could you elaborate on this?
My stock lights on my Titan look like this.
The low beam bulb is in the larger housing and is more focused. The high beam bulb is is in the smaller circular housing and is a very broad light. It's not focused at all.
Now look at the Ford headlight.
The low beam and high beam are all in one bulb. So when you put an HID in there, that's 5x brighter than a standard halogen bulb, the light will be scattered in all directions and be blinding because it lacks focus.
The titan low beam, even with an HID bulb will be very bright, but still focused.
Perhaps this will help.
Titan vs. F-150
Hope that helps, that's the best that I could explain it.