Wrong...
Considering that many auto models offer this type of style straight from the factory I fail to see how your sarcastic response was warranted. Nonetheless, it is my understanding that these will in no way, shape, or form distort or diminish the ability of the actual lights to perform as designed in a safe manner. However, in reality that is the kind of thing I was looking to find out and is part of the reason why I asked specifically about the differences between the shades.
Anyway, if somebody has experience with these things and would like to offer some insight that would be great.
Thanks!