How can cold white or warm white be programmed on an RGBW neopixel strip?

[MasterJarJar13]

How would these colors be programmed?

[Forgetful Jedi Knight]

They aren’t. It all depends on the white diode that the manufacturer uses. It’s either warm, cool or neutral.

[RavenXp]

Yeah, as FJK stated, it's a physical change of the phosphor composition to get the color temperature. not something that can be altered with coding.