Day by day, in my car I have had the same H4 for 8 years. Especially under adverse conditions e.g. wet or oncoming traffic I see quite little. That was already before, I think at least, but less pronounced. Can it be that the lamps subside? The headlights themselves are according to the age in order. I also often think that other road users are much brighter on the road. So also those that seem to have halogen lamps. What are your expectations? have you exchanged working old lamps? The Internet gives contradictory answers regarding the aging of halogen lamps.