Quite good bulbs, I put them in a seat ibiza 6l (2003) that had halogens of 55W (or at least that's what they were labeled) and there was a big difference in the light (plus the color was nicer, slightly towards blue). The installation was easy (I had to remove the cover from the light since they wouldn't fit otherwise, and the little metal brackets that held the halogen in place found the base of the bulb and snapped into place without the bracket, so everything is fine). Now, as for the durability issue, the manufacturer claims 300,000 hours on the box, if they last for a considerable amount of time, I will come back and make a note of it

Very good choice, strong white light, personally I adjust them lower so as not to bother the opposite side. I come back on 31/1/21, installation and on a large scale H1 perfect lighting. 12/9/21 all good, perfect awesome light. 23/11/21 fantastic light, very clean, everything is perfect