Elantra headlight aiming

Just replaced a low beam halogen bulb and noticed that the beam is not level
with the other side - noticeably high and probably annoying other drivers.
I double checked that the bulb is in the socket correctly, so I guess the
lens box needs to be adjusted? Is this pretty straightforward?

 

Yeah, there's a hole in the top of it, into which you can stick a
phillips screwdriver, and turn to aim it up and down.

Although personally I'd double check that you really really really
have it seated correctly - I can't imagine that why it would go that
far out of alignment for no reason.

 

..
Thanks for the reply. The bulb in question is on the driver's side and it's
hard to get at (I'm trying to avoid removing the battery). If the bulb is
slightly off center would it throw off the beam?

 

If the bulb is not seated properly it will be aimed incorrectly as well
as possibly leaving a gap for the elements to get inside the housing

 

If the bulb is not seated properly it will be aimed incorrectly as well as

I'm happy to say that I got this right finally and didn't have to adjust/aim
the lamp. By the way, replacing the bulb has made me more aware of how
clouded the lens has become on both lamps. Can this be improved by rubbing
with fine polish?

 

There are commercial products for polishing the lenses but there are some
home remedies too. Perhaps a goggle search will find some.
Here is a start
http://www.popularmechanics.com/cars/how-to/maintenance/4252611?page=2

 

My experiences were unsuccessful, although some of my earlier attempts
may have thrown off the future attempts.

I ended up buying relatively cheap 3rd party replacements.

 

Can be done, and the results are OK, but, it's a lot of work (about 3
hrs per unit).
Also had to have power tools to get it right, and have some experience
polishing metal,
the trick is to start easy, wet sand #600 then up #1500, then white
rubbing compound,
and a lot of polish with a foam or cloth.