i used to have these on my polo a few years ago. ( ino its not an audi, dont skit me LOL) basically the light is no where near as brite as the OEM daylines. neither do they dim out when you turn on your indicator. but yes they can be seen aslong as the sun is not blazing. typical winter weather they can be seen in the day, otherwise just before dark or even at night they can be seen clearly. the 2nd picture is actually a really good design compared to the 3rd ( or the one in the link ) which is similar to the lights of the A4 they look nice from an angle but look a bit silly from the front.
heres a pic to show brightness on my old car ( yes only 1 side was connected at that point )