Thanks for your help Paul, I'll try to be more clear. There are 100+ segments (edge-lit plastic light guides), each lit by a 12V constant-voltage strip (pure white, about 50-200mA per strip depending on segment size). I want to dim the segments individually (not the individual LEDs, that would be black magic I agree). I should be clear, I've done all of this before, but I've had at most 50 segments. Now with 100+ segments I just want to make sure I'm using the best approach in addressing and driving them.
I'm not so concerned about brightness, the installation is for indoors.