I drove yesterday for about 2 hours with lights on, and then stopped to make sure my van would not catch fire
The housing was just warm, and it was barely noticeable through the rubber cap that goes over the bulb housing. I didn’t check out each individual part, only the electronics that are supposedly helping to adjust to the voltage of the car and avoid flicker. I guess they are effectively making the LEDs appear like halogens to the rest of the van electronics. These parts were warm, but not hot at all.
I just checked whether the LED housing really contains a fan and yes it does. You can clearly feel the slight vibration. I guess this will put a natural end of life to the LED system at some point. But I didn’t feel any noticeable air flow coming out or into the unit.
The overall design is of course absolutely horrible. Having to stuff the LED system, the round thing attached to it, and then this flicker preventer thing into the headlight assembly works, but is not exactly confidence inspiring. But so far, these babies are doing their jobs. Even if they would die on me in a year or less, I would use them again, the light is so much better.
Bear in mind that we are only talking about the low beam bulb though. I have not replaced the high beam, and things may look very different there. For starters, I think the housing of the high beam bulb is significantly smaller than the low beam bulb. Plus, the high beam bulb would likely put out significantly more energy, and hence produce more heat. I personally don‘t make searching for high beam LEDs a priority. My main issue with the halogens were the low beam visibility.
The only downside right now is with high beam, the low beam white LED light and the yellow halogen light of the high beam overlap each other. Definitely looks weird, but it is not a big deal.