Due to heat from the sun and the 2000 degrees heat from your halogen bulb in as little as one year can degrade the protective silicone hard coat on the lenses. This exposes the lens to road chemicals, insects, humidity and acid rain which damages your lens. This damage restrict the headlights ability to project its beam at night and during adverse weather conditions by as much as 70% . would you prefer to see road hazard at 100ft or 350ft . while traveling 65 MPH at night ? AT 100ft . you will not be able to avoid a collision. We can restore your headlights to its original look.