When you go HID, you should be using projector headlights. You can upgrade to Spyder projectors fairly cheap. They might only last about 5-10 years before they are ready to be replaced. Don't throw out the stock lights.
https://www.spyderauto.com/product_list.php?car_make=Ford&car_model=Expedition&car_year=2010&submit=Go+!. Buy the headlights
first because some aftermarket headlights use a different bulb.
As far as HID. IDK. I ran them for years in my Charger and it seemed like every 6 months a fog or a headlight would go. I tried various brands (each claiming to be best) but ultimately it was a PITA diagnosing why they would stop working. Not sure if the Expedition has the same constraints as the Charger, but Dodge put the smallest grade of wire for headlights/fogs. The HIDs are pretty demanding. I ran 35w and 55w but it didn't matter. I replaced a lot of wire as well as the 9006 sockets.
My Spyder headlights eventually yellowed and the LEDs stopped working. I bought a new set that didn't have projectors. I switched to LED lights. They are just as bright. I kind of wish I didn't monkey with HIDs for so long and just tried LEDs instead. They fire up as quickly as a halogen and are instantly bright. The HIDs took a good 5 seconds before they were at max brightness, so I didn't use them for my high beams.
Bottom line, consider LED over HID. Just be sure you get a decent set that doesn't interfere with electronics. The fog lights might be a smaller grade wire, so they sell "fog light LED bulbs" that draw less power. You can match the color of the headlights or you can buy yellows. Whatever you prefer.