^^^ What he said !!!
If you have plastic headlight lenses, cleaning/polishing them (if they're scratched or yellowed) will help a lot. ALL (No matter what make) ALL halogen light bulbs dim with age. So, your OEM headlight bulbs
are not as bright as exact replacements will be. That said, there are some upgrade bulbs available that are slightly brighter than OEM headlight bulbs, but as stated above, stay with the yellow or white bulb color. The "ultra-blue" or more purple don't improve vision and actually may not provide as much visible improvement as just cleaning/polishing and replacing the OEM bulbs.
There is a great explanation of brightness, color and clarity at the Sylvania website, located here:
https://www.sylvania-automotive.com/...ogen/index.jsp