Originally Posted by rondocap
The normal heads are supposed to be mounted horizontally, but the "BMW Edition" heads were engineered to be mounted vertically, and as long as it is installed correctly, I have not read or heard of any performance issues.
The diode is made so that vertical mounting is OK.
Dude, I'm not sure where you're getting your info but there are no specific versions. I'm in touch with Cliff (The US Retailer) on a regular basis, as I've been with LI since their initial US release. There are no "BMW Edition" or alternate versions. They are not supposed to be mounted vertically for optimal performance.