Not much difference, the 3rd brake light had 3 bulbs in it originally... the way it is now, it's only slightly dimmer than before. Hardly noticeable.

I bought an extra third brake light from a the classifieds section of another forum in case I screwed mine up. I ended up using a step drill and got it to work the first time without problems. I used black silicone to seal the outside, and epoxy to secure the rear of the camera in the housing. The reflector is still in tact, so the other 2 bulbs still reflect some in the center outputting a little light.