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Just to add my 2 cents here...albeit a little late. Jeph has it right when he says the bluish color is caused by the prism effect of the projector's cutoff shield. This is a chromatic aberration. My SL500 HID projectors have this, but they are in fact 4300k (stock, OE Osram 35 watt D2R) bulbs. It's (the blue/purple part) only visible on the edge of the cutoff...usually what the oncoming driver sees.
Also, to get the higher color temps, the bulbs are just tinted....much like the cheap halogens that claim to be HID. The problem is that blue tints filter most of the light that is visible to the human eye.
I've worked with specialty vehicle lighting for many years and have done some special application designs...I've seen all the junk out there!
It's good to see that the retrofit kits that use D2 HID lamps fitted with H7 bases are getting better, with more accurate focal points....or, to put it another way, they're getting the actual arc of the HID to be more accurately aligned with where the H7 halogen filament sits. A properly aligned converted D2 bulb will have the same beam pattern and cutoff as the H7 when installed into the Boxster headlight housing.
Again, just my 2 cents...
~M
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