66 dart LED prototype working for now

Another method you may consider to get the proper variance between dim and bright is to make the inner-most 12 led's (per your drawing(and keeping the "outer ring" for running) activate only in brake/signal mode. Eliminating these 12 will reduce your lumens (hopefully enough) to get you the variance you would be looking to acheive.

This may not work. Just a suggestion from someone who has ample time at the soldeing iron.

I thought about that and tried it first (didn't like the looks) and decided I wanted to get the maximum allowable brake/turn lumens (when I stop I want you to know it) that's why all 4 are used as turn/brake along with running lights.

I'm waiting on the photographer to drop off his meter and show me how to read it correctly (this time) I checked it wrong and read it wrong, also on the wrong setting too! total screwup and my fault for not asking.

Since I'm doing this for both my cars I'm going to make a pattern and add a daughter card for the resistor packs so I can just make the packs in different levels and just plug them in using male/female pin strip connectors to test instead of having to re-solder the resistors in each try.
full bright looks to be ok, I'll really know more when I can test it correctly using SlantSixDans instructions. I'm working on the front's now because I know they weren't up to snuff as they say.