As far as headlight bulb life. I've found that living in a cold Midwestern temperate climate, (Illinois), is a lot harder on any type of filament bulbs, than living out here in Arizona for the last 27 years. (I can't speak for LED's because they didn't exist in cars when I lived there). Back in Chicago it seemed like I was constantly replacing headlights, turn signal bulbs, dome lights, "courtesy lights", and just about everything else. Not to mention all the cars you would see driving down the road with their back up lights on, because they were all shorted out from all the road salt splashing up all over the transmission.
Out here in Arizona I have only replaced one headlight bulb. That it. In 3 cars, and 27 years of driving. I believe this is because of the warmer weather. I can think of no other reason. I also have never had an engine leak out here. Back in Illinois they were constant as well. Valve covers, water pumps, radiators, thermostat housings, name it and they leaked. And they ALWAYS leaked in the Winter, never in the Summer.
In January back there when it got down to 0F or below, you would start your engine, and it was literally a frozen block of ice. 10 minutes later it was at or near the boiling point. (190-200F). Shut it off, and 8 hours later when you're ready to drive home from work, it's back down to 0F again. I totally believe all that contraction and expansion over a period of time causes leaks. At least far more frequently. And it's the same with frigid temperatures on light bulbs. Anyone ever notice one of the first appliances to go to LED lighting were refrigerator freezers?