Output is vague. Oem lenses aren't designed to allow light to pass unobstructed on usdm models. Still better than halogens, but produce a frightening amount of glare to oncoming drivers. The oem lenses scatter light from halogen bulbs and reflector bowls to give it a softer beam, less hot spots and more coverage.
To maximize hid retrofits or halogen projectors requires a lense change. Notice how all new cars or hid/ halo projector equipped cars only have clean plastic/glass lenses?
This is the only reason why I haven't put my d2s hid projectors into my ef because I haven't purchased clear lenses yet.
You can find your retrofit needs at the retrofit source or google. There's shit tons of info if you search.