Originally Posted by stealth.pilot
The bmw sensors have one vertically polarized laser diode per head as opposed to one horizontally polarized diode in the regular sensor. This means the BMW sensor can be mounted on its side vertically but cannot be mounted horizontally.
The HP head has 2 laser diodes per head instead of one, and one diode is horizontally polarized and the other vertically polarized. This gives both increased coverage area and also twice the jamming power.
So the BMW specific vertical sensor is a normal powered version, just with a different orientation of the emitter.
Do you think one of the HP emitters would work centred over the license plate?