That brand is well known as crap. QC is very poor. A simple Google search for xentech will give a few thousand "its garbage threads". On cars, the suckers last a year some times, many don't last 6 months. Most of the kids around here buy them and you see them often with one eyed go fast honda civics and such. I have the 35 watt kit from DDM and it is well made. Nice white 4500K bulb. The kits are not DOT legal, so keep that in mind. The 35 watt is brighter than a H4 high beam. So, its like running around with a high beam X 4 or more.