I'm bumping this. Plastic lensed/housed bulbs now are terrible when it comes to scratching, cracking and yellowing. The '06 Sonata we had, when I traded it last summer for the Genny, well, by that time I'd had to use a headlight restoration kit on it twice. Out here, the SUN is brutal, and we often get into dustdevils, dust storms and heavy winds with blowing dust. Not to mention lots of construction. SO I got online and ordered, from Xpel (
http://www.xpel.com/products/headlight_protection.asp ) a kit for the Genesis. I think it was something like $65 for the four sheets...fog lights and headlights.
When you consider that the headlight housings now retail for over $500, well, it makes sense to get some protection for the housings. Anyways, that was towards the fall, so one day I decided to install them (I'd done some googling for videos, etc). Well, I got the foglamp films on just fine...as the fog lights are flat...no problem. The headlights, due to their severe curvature, were another story. I started then stopped realizing that it was beyond my skills...I checked with one tinting shop and he said he doesn't touch 'em and the other one said to make an appointment. I didn't get around to it until this past spring (not to worry, we do not drive the Genny a lot and there was no apparent damage or abrasions on the lights). I called the local tint shop and the guy did a pretty good job for $60 installing the things. It has to be heated with a heat gun and stretched while trying to slide it on and stick it...so now we're happy with it. The films, while not invisible (once dirty you can notice their presence, but they wipe right off). The fogs are holding up well.
The thing with the plastic lensed lights is that ANYTIME you wipe them, it needs to be done the right way or the plastic will scratch....over time, with UV exposure, they start to look crappy. Before the 'advent' of headlight restoration kits, I used to buy stuff for marine use...boats...to restore plastic windshields, etc and it worked fine on headlights. Cheaper too.