Re: CCFL Halo out and dead...
I have those lights except the halos in mine are LED. I'm not familiar with those in the CCFL but from other experience those cheaper ccfl's never last especially in an exterior automotive part. As far as what to do as a replacement I'm not sure because it would require taking the headlight apart...which btw isn't that hard, but they won't send you replacement parts that's for sure. If you didn't use those headlights as a HID projector retrofit, then maybe just see if you can get a replacement headlight...or worst case buy a new set....in LED.
I have the LED ones which you really can't even see in daylight, but at night they look great. I have them wired seperatly and just have them turned off most of the time anyway.
2015 Jeep Grand Cherokee High Altitude, Bright White, V6, HK audio