ok, cool. that clarified things a little.

I gather that 12c is better if you want to address individual leds, but it takes more work.

I think i might get 30 or so of your ShiftBrights to make a neat Christmas light string. Unfortunately i don't like the pin headers sticking out the back, so i think i might order the header-less ones, and attach 90 degree headers. You should carry 90 degree headers in your store.