Howdy Everyone,
I am building a custom made third brake light for a concept car and wonder if it is possible to "hard"-wire a specific color on the WS2811/2812 LED strips .. and you probably know which one 
Red.
If it's not possible, I have to figure out how I can set the Red color via the Arduino (probably burn directly without bootloader).
Thx,
Andy
Buy some 5050 SMD LEDs in red. They're dirt cheap.
Why use WS28xx LEDs?
There are plenty of other LEDs better suited to the job.
...and no, you can't hard wire them to do anything.
I should be more clear .. I am still using the RGB LEDs but during "normal" operation the brake light should work as expected
'still using RGB LEDs...'
for what?
Either way, you need to drive the WS LEDs with the neopixel library or similar, or drive strings of RGB LEDs with 3 pins of PWM to mix any colours as needed.