I have the Matrix Online projectors, and the halogen light output is OK, but I want HID for the lows, will the light still be minimal with the HIDs or will there be a big improvement?

huge improvements, you will never go back to halogen

Well here is an example, When I first put my hids on people were flashing me all the time cause they must have thought my brights were on so I had to aim them a little lower and now there just as bright but pointing downwards. I love them and would never go back (don't know your year but keep in mind you may will lose your brights if your a late model

Nope, I have the 4 headlights, 2 for lows, 2 for highs, and these are my actual headlights: