The light output was basically limited to all a reflector type headlight assembly can do for you. The black finisher over the pair of wells is what allows light to escape so you are in fact limited to only what those openings let out.
The projector on the other hand, it focuses the beam so no light energy is wasted via scattering.
I have never used H.I.D.'s but with the projectors and normal bright yellow bulbs the night vision is vivid. You see the white lines on the road white, you see the grass at the side of the road green, the asphalt is as it would look during the daylight and not to mention you dont have to worry about energy wasted towards blinding other drivers.