umm the stock lexus lights u are talking about are HID... those are not simple bulb replacements but involve a ballast and ignitor to keep the HID bulb from exploding since they do not use filaments like normal bulbs; there light comes from a arc or sustained spark. HID conversions cost about $500-$800 per pair... i have 2 pairs. here's a pic of that light color
low beam 1000K, high beam 6000K:
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