Bi-Xenon means that that the single projector can do both low and high beam. There is a plate inside the projector that flaps down creating "hi" beam pattern. That's why I don't understand what the reflector bowl does on the E53.

On the E70, it's bi-xenon and the inner light is actually to light up the corona rings and the bulbs purposes is just for that only.

I have no DRL laws in NY either, just gets you a discount on your insurance if you do.

Lots of cars pre-led scene (basically before everyone started copying AUDI R8 LED lights) DRL was always used by a low voltage high beam or dual filament on the low beam lights.