A few weeks ago I came across an almost new, Valeo brand, LED headlamp assembly.  This one was from a BMW, but as it was a Valeo item, it is probably very similar in design to the headlamps that go in a lot of new cars.  When complete in its enclosure there is nothing much to see, really.  So, I did what any person would do, I sawed it in half to have a look. Beyond all the 'Angel Eyes' BMW bits, you eventually get to the main beam unit, pictured below.  I should add that the two halves of