i assume youve been told the car your looking at has 'xenon' bulbs which usual means they have stuck in some 12 quid bulbs that have ultra xenon on the pack, these are normal just standard bulbs but whiter, real xenon bulbs require projector head lights in order to 'project' the light forward instead of causing glare by dispesing light. personally i would replace them for a H.I.D kit from ebay or similar.