This pair of D4S Xenon HID bulbs are a direct replacement for your standard bulbs.These will only fit factory fitted Xenon HID Kit. Will save you on dealer prices. We have had customers call us up saying the dealer wanted 120 for 1 bulb!Factory colour temp is usually 5000K12 Month Warranty12v 35W as standardUV Cut Quartz GlassExcellent quality with the Metal constructed baseMurcury free (The difference to D2S bulbs)