My Silverado LT had th LED headlights, while my Sierra SLE has HID. Both have the LED fog lamps. Both were/are the All Star Edition. I just don't know why the Sierra has HID's. Granted, the HID's project more light, or its my perception anyways. But I am OCD as hell, and want my headlights to be LED also, lol. Because I'm terrible at getting to the point, and in the words of my Supervisor, "Mastered the Art of beating around the bush", is it possible to have a dealership swap them out? And how much would you think that would cost? And how do the folks that have HID/LED like your choice of headlights?