I might ask a few questions first as the situation can change the answers.
What is the problem as far as you can tell us? Are the OEM lights just not bright enough, don't aim down the road far enough or something you can define?
Part of my reason for asking what seems simple is the way weather effects the lights if you live in the wrong parts of the country!
Here in the Central Texas area I often meet cars that have lights so dim, I wonder how they can see at all at night!
The combination of the strong sun combined with the constant dirt that we have in the air can degrade the lens so badly that it needs to be changed. Driving in sandy areas frequently can sandblast them ? When looking at the lens of the lights, are they clear or does the glass have a thick haze appearance? It may be as simple as changing out a few parts if the lights were okay when new?
I might start with the assumption that the lights had to pass a minimum design spec and look first at whether they are just old and worn out?
Maybe getting the aim adjusted after years of shifting might be a solution?
Maybe a trip to a garage that deals with headlight aiming would be worthwhile?
Our eyes are not really very good at testing some things.
I tend to try for the simple solutions first before jumping to more difficult!