No problems with the headlights at all. They fit fine, and heat hasn't been an issue. I don't know how many hours i have on the bulbs, maybe 40 or 50 ? The lights are on several hours at a time whenever i snowblow at night. The bulbs i put in the tail lights are different, with all the diodes facing out the rear, instead of the diodes being all around the bulb like the headlights. I did have to grind out the bottom of the tail light bucket a little, then epoxy over the hole i made to make them water tight again. Overall i'm very happy with the LED bulbs so far.