Once considered a task purely based on appearance, restoring your headlights to their original clarity is far more important than it appears. Yes, they do look unattractive when cloudy and restored headlights greatly improve your vehicles appearance and value ... But in bad condition they also block a great deal of vital light.
The ability to project light properly is of utmost significance for you to drive safely at night. Oxidisation of the plastic headlight, alters and disperses the light forwarding past the lens cover, severely decreasing the amount of light which is brightening the road by as much as 90%. The greater the severity of the oxidisation, the worse the situation becomes, producing glare and distortion for others as well as yourself.
The lenses are made of polycarbonate plastic which needs to be cared regularly. Basically you haven’t done anything wrong; it is a natural process which without maintenance leads to a yellowed and cloudy appearance. High operating temperatures from halogen bulbs, rain, UV sunrays, fumes, road salts and debris all play their part in deteriorating the surface. However how you deal with it is within your power. Hazy headlights make your car look aged and decrease your safety.
Eventually the yellowing causes the plastic to break down. Starting from the outside it progressively works its route inward until it eventually directs its path all the way through and then there is no choice but to replace. Remember headlights are units which are sealed so it is not possible to singularly replace just the outer cover.
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