2. Are your headlights dull, cloudy or yellowed?
Headlights are covered with a clear protective coat, but with daily UV exposure, rain and salt exposure this can wear away. Layers of dust, mud and pollution, as well as daily road debris damage, can make your headlight lens appear dull, cloudy and yellowed.
Halogen and other high-intensity headlights operate at very high temperatures. This further contributes to the yellowed, damaged appearance.