I run 8000k's in the highs and the lows and like them a lot. I have 55w a/c lows and 35w d/c highs. I am running stock fogs and I added 6" Hella's running the "blue" bulbs.
Now for differences the A/C HIDs don't flicker like the D/C ones do. I am not sure flicker is the right term. The arc moves inside the D/C bulb, so if you are behind a car at a stop light lets say, the headlight will bounce around on the back of the car in front. However I do not notice it any other time. The other thing with the D/C kits is the arc always travels the same direction in the bulb. After my first set failed I found the one end of the bulb was cracked from heat.
As for the stock bulbs in the fogs they look weak when compaired the to headlights. It is just a color thing because I still get great output from the stock fogs.
I am still thinking about 3000K HIDs for the fogs to get the yellow color.
The cheap blue "HID look" bulbs I have in the Hella's, don't even come close to looking like HIDs. And when compaired to the light output again not even close.
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BTW the pics is with the highs and lows on.
That is why a friend of mine said "What are them......Turn signals??
". So now I have to upgrade them too.
If you decide to do HIDs the capacitor mod works well to correct for the reduced power in DRL mode and with perimeter lighting. With HID lows you will not need your highs much. However you may want to also do a 4 light setup. The warm up time is not obvious on start up but take my word for it when you switch up or down you WILL see it.
The first time I did was from HID lows to HID highs at 70mph, and it was like turning the lights off completely!!!!
Hope this helps.