Front Driver Headlamp Dim on 2006 Nissan Maxima

I thought I needed my HID bulb replaced so I went ahead and had both bulbs replaced, but the driver side HID is still dim. Could it be the actual headlamp? It's not as bright and the passenger side.

1 answer
If the outside of your projector lens seems dusty or you can't "look inside"; there is dust inside the assembly. I replaced 1 entire headlight, the new one has clear lens and blue/white light. I replaced only the bulb on the other side. On old HID low beam there is a noticeable line across the old headlight lens due to dust/dirt/damage inside the assembly. No help from dealer on how to clean it. Plan to remove headlight and attempt cleaning with compressed air.