Frankly speaking, all of headlights will get dim that not only for halogen.

The problem of halogen headlights get dim quickly than led bulbs.

For example, halogen headlights get dim 10%-20% after lighting 5-10 minutes.

Although halogen headlights get dim, they are still good performance during foggy, rainy and snowy days.

Because most of halogen headlights are warm white, they are stronger penetrating in bad weathers.

When you find halogen headlights get dim, please contact my factory.

Because our halogen headlights are top quality and best price in China.