Antonio, I am not going to dipute what you said above, because it is basically true.
However, I was trying to tell people that the bulbs are specifically designed to work in conjunction with respect for which optics they were made to work with.
All of you guys with D2S, pull up to a BMW, Audi, and compare the brightness of your lights. It is going to be dark purple compared to the hot pink of those cars.
To illustrate this point even further, a Lincoln Marc VIII uses a 4800K kit, with a D2R bulb. This is almost 1200K less than our 6000K, and yet they look brighter. Why? Because the focal point is picking up the most intense spot on the bulb. The D2S focal point is designed to be used by a Projector optics unit, which works in a totally different way. In addition to this, the D2S has at least 2mm lenght difference than a D2R. If you are into optics, you know that this means a difference between a light output that can bring the sun out, or one that looks like a real expensive PIAA bulb...
-Milan