Most of the amber bulbs on each lightbar were not working. I didn't care, I just wanted white LED bulbs to work. I unrolled the lamps and laid the books on them for a few days so they could lie flat when resting on their own. I poured gasoline on a rag and cleaned the painted area on my truck that I was going to put them on and then used window cleaner. They have settled in very well and are still holding up in the 30 day summer heat. I am happy with my purchase. but I'll admit I'm cautiously optimistic about how long they will last given the yellow lights struggle on day one. 3 stars due to lack of trust. People notice them and ask where I got them from. They definitely declare their function of opening and closing doors.