Like I said, I haven't noticed any hot spots on mine. I use ddm tuning bulbs and ballasts and a h4 conversion for the flap in the projectors. You can easily bench test them with a h1 halogen bulb and check them out in a dark room or yard and send them back to amazon if you don't like them. Ive only installed 2 sets. The set in my 80 is only 6 months old, the set in my 4runner is about 2 or 3 years old. Its very easy to crossthread the nut on the back so be careful to get the nut on straight. Also the clip that holds the bulb in is kind of cheesy. It won't fall apart or anything, just not super user friendly. Also you have to make sure you get the top lined up with the top of the housing. As you tighten the installation nut it will want to spin off center if your not careful. Just basic mechanical knowledge and forethought though will get them installed right.