Kelvin is a measure of color temp, I don't think it has anything to do with the actual bulb temperature. Anyway, the brightest HID is around 3500k, or whatever is listed as bright white. The more blue you throw in, the worse the light output. But 5500k looks wonderful from an aesthetic point of view.
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'13 Mustang 3.7V6 - MT82
'00 GP SE (L67 Swap, XP, Headers, 3.25")
'98 GTP, '01 Bonne