Other point of concern. If I construct a quad projector array using a dedicated low beam in the upper segment, and bixenon in the lower segment, I have clearly destroyed the internal facing, which means there is no real need to keep low top bix bottom, they could be swapped... maybe. Anyways, quad array will have a problem with flash to pass (F2P) when the headlights are not active. Thus it comes back to leaving the projectors on continuously, or installing four sets of CCFL/LED angel eyes, and rigging those to activate only for F2P w/o headlights active, and otherwise, have the angels disabled.
Angels look great on BMW's, not so great on a G.