I want to do something really simple.

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1

I want to do something really simple. How do I turn on all led to one colour?

2

This is probably the easiest and fastest way:

fill_solid(leds, NUM_LEDS, CRGB::Red);

3

A more verbose way:

for (int i = 0; i < NUM_LEDS; i++) {
leds[i] = CRGB::Red;
}

4

Brilliant! Thanks!