25-08-12, 10:51 PM
(24-08-12, 01:59 PM)b1k3rdude link Wrote: ...Early versions of HID kits and some of the cheaper current versions used bulbs that were a different size from the bulbs they were replacing. The result was a misaligned light beam which failed MOT tests. Most modern kits (including the ones I have fitted to bikes and cars) use bulbs with the same light source placement as the units they are replacing. Therefore they have the same beam pattern. Unless you do something stupid like use 10k bulbs (which are so blue that you can't see where you are going and look about as cool as a used condom on the parcel shelf) you are not going to attract undue attention.
Why then are they illegal?
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Have you ever fitted a HID kit..? how exactly have you been able to 'adjust' the position of the bulb. Also the incidental light off a HID bulb is that much brighter and its this that is exaggerated by the reflector because its not designed for it.
So why is it 'illegal'? The document you posted uses the same reasoning that I have, but also makes it clear that this is their 'opinion', it is up to the courts to decide on a case by case basis if an offence has occured. Used sensibly, HIDs can significantly improve your safety and visibilty without adversly affecting any other road users. Be stupid about it and expect to get nicked.