You should check the voltage at the headlamp to make sure it's not a wiring issue.
I was unhappy with the over-the-road brightness of the stock headlights on my 2003 Lexa which I bought used last year. I did three things, after which the improvement was amazing. Note that they weren't overly dim (which to me implies a wiring problem), they just didn't light up the road enough for me to feel anywhere near safe on an unlight highway at night.
1) I used a headlight lens polishing kit to polish out the lenses. The dull lens was clearly diffusing the beam.
2) I swapped out the bulbs for Sylvania Superstar Ultras
3) I aimed the headlamps. The right lamp was aimed down and to the left, it was doing approximately nothing re lighting up the road. I won't go into details here, plenty of other posts, and of course most shops should be able to do a decent job.