If you want light output, then keep the OEM housing. You will get less light with the projectors (ok perhaps not less light, but its gonna be more focused, so it's gonna look like less.
I got them for 2 reasons:
1) to match the color of my xenon headlights
2) to fill the space between the front of the car and the brightest part of the low beam hitting the road. The low beams are 50w, and the fogs are 35.
Here's a picture (not my car) of the lights off. If you'd like something else, let me know and i'll shoot them