Voltage drop over long pixel runs illustrated.  http://blog.holidaycoro.com/2013/05/a-demonstration-of-effects-of-power.html These guys (HolidayCoro) have WS2811 LEDs

Archive FastLED Archive
1

Voltage drop over long pixel runs illustrated. http://blog.holidaycoro.com/2013/05/a-demonstration-of-effects-of-power.html

These guys (HolidayCoro) have WS2811 LEDs in some interesting form factors. http://www.holidaycoro.com/Smart-RGB-Node-LayFlat-2811-50-Count-p/685.htm Might be a supplier worth looking into for various things.

(Can you tell from the last couple of posts that I’m about to do battle with some power issues?)

2

You can quickly estimate the voltage drop of a pixel string using the calculator at http://blinkyflashy.info/calcs/pixpower.php

Hmm, I should add a dark current input to the calculator.