I'd seen this one elsewhere. Seems reasonable to me as they (headlamps) were never designed for LED's or especially HID's and unless in the case of LED's the position of the light source matches halogens, the beam pattern will be off. In the case of HID's, unless the headlamps are fitted with washers and levelling (either suspension or fitting itself) they are illegal anyway. I,e you can't replace your headlamps with ones designed for HID's unless you also fit washers and levelling.