Steve,
I'm not sure if you knew but I have a set of Hella 4000(Luminator) HID driving lights (actually have two sets, but...) that I used while visiting Utah earlier this month.
I have no experience with the halogen counterpart, but when I turned them on it just blew me away.

Now I'm not trying to sell you mine because I'm not selling them (keeping them both for myself

).
I believe the color is right around 4200k, which is not quite as bluish as the ones that are popular nowadays like 6000k and beyond.
I only used them on short stints and while I would not recommend on turning them on and off to often for durability, if you can leave them on for at least 20 seconds at a time they are just plain super! I would use the phrase "night and day" without reservation.
I'm not here to argue Cary or Doug here, but this is just my opinion. I've said it in another thread but my buddy who went down to Moab with me (he's very familiar with Moab) screamed "HOLY s***!!!" when I turned them on, and he usually does not curse.
Anyway, I guess you can take my comments with a grain of salt.
Mot
BTW, did I tell you I also have two pairs of the Hella FF1000's that ranked 3rd in the HID shootout in the above-mentioned article in Utah?
Good luck with your quest!