Xentec uses DC ballasts to power AC bulbs. They will work but not for a long time. Xentec has been an ebay vendor / brand for a while that constantly changes components as they are always on the hunt for a lower priced item. Obviously i'm biased when it comes to HID kits however there is a reason we have been a trusted seller of HID kits
since 2001 and a supporting vendor on this board since 2004.