Changing them is more work than polishing the lens.
Try that first, it's a lot less money.
Many kits available to do it and many ideas on you tube also.
Just a thought.

 

Just before it got cold out I was eyeing up this kit. Good ratings and I saw a recommendation from a member on another vehicle forum I'm on. I'm going to try this one in the spring.

 

I have to do one tomorrow. Temps are warm here for 3 days.
Going to use Mothers Mag Wheel Polish first


Then 303 Protectant
This is for plastics and is a UV protectant.



I'll take pictures before and after too.

 

I did a small video on using Mothers and I did spray the results with 303 took about 15 min for the whole job. eventually I may have to change it out, I am not much for doing youtube.

 

Ed ke6bnl

I used my Milwaukee 18v cordless drill set on #1 drill setting.
I found out don't use #2, it throws the compound all over the place.
Use foam polishing pad kit (4inch) I bought off of Ebay
Found you have to press into the drill to get better results.
A larger machine like yours probably be a better choice.
Here is a picture of half the lens polished. There is a line in the middle.
My lens wasn't that bad, but you could tell it was different from the other side
Could the polished side be better ? It's a possibility. Maybe try after the winter.

 

The original question was about replacement headlights, so I moved these to here as it is more information and instructional

This stuff looks way to easy to be true! Anybody try it yet?

https://7secondssmile.com/pages/car-light-cleaner