Represent an RGBW Light in HomeKit

So I have got an RGBW Light and I don’t know how I could perfectly represent this in HomeKit:

I have 3 incoming nodes:

1. ON switch (it returns an ON/OFF - this is sent to HomeKit as On: true/false')
2. Color channel - this returns a HSB (3 parameter - Hue, Sat, Bright) like string - now I get these datas by splitting this string and sending to HomeKit as Brightness, Hue, Saturation.
3. I also have a White channel which returns an int (0-100) representing the brightness of the seperate white LEDs. I don’t know how I could include this, because HomeKit doesn’t seem to have a seperate Brightness (like WhiteBrightness or something like this…)

[crxporter]

You inspired me to finally take a few minutes to adapt my lights to a color bulb in homekit.

in the wiki

[Shaquu]

Regarding rgbw try this code:

let Ri = 254;
let Gi = 0;
let Bi = 80;

if (Ri === 0) {
  Ri = 1;
}

if (Gi === 0) {
  Gi = 1;
}

if (Bi === 0) {
  Bi = 1;
}


let M = Math.max(Ri,Gi,Bi);
let m = Math.min(Ri,Gi,Bi);

let Wo = m / M < 0.5 ? m * M / (M - m) : M;
let Q = 255;
let K = (Wo + M) / m;
let Ro = Math.floor( [ ( K * Ri ) - Wo ] / Q );
let Go = Math.floor( [ ( K * Gi ) - Wo ] / Q );
let Bo = Math.floor( [ ( K * Bi ) - Wo ] / Q );

console.log("Input RGB: [" + Ri + "," + Gi + "," + Bi + "]");
console.log("Output RGBW: [" + Ro + "," + Go + "," + Bo + "," + Wo+ "]");

Output is:

Input RGB: [254,1,80] Output RGBW: [254,0,79,1.0039525691699605]