Have several newer vehicals that the headlight lenses are getting clouded over one in particular that was a hazzard is my 2005 frieghtliner columbia. The only way to fix it besides buffing them out is to buy new headlights at a cost of 250 a side we can now see very good with the new headlights but what happened to the glass sealed beams we use to have? What was wrong with the Halogen Sealed beams?