I note there is a big difference in the colour temp of HID lamps - and it seems there is a preference in the lower temps - around 4-5000. I have only ever seen HID lamps in upmarket cars - where they seem to have a blueish tint - I have never even driven such a vehicle at night to compare with conventional head lamps - so I am reliant totally on the opinion of others in this. Is this just a matter of simple taste - or are there real benefits to a lower temp lamp - and if so why are many lamps still a higher colour temp.