switch. Someone posted on an Audi site I frequent that they are being accused of advertising bulb temps of a broad range but really only stocking/ship like 3 or 4 different temps. So depending on what temp you order you may or may not receive the temp you ordered.
With that said, I have DDM hid's on my Z and they have been great so far...although I think I was a victim on the bait and switch because I ordered the whitest one they had (4300 or 4500) and got much bluer.