hue filament White Ambiance color script

[cheist]

Hello 

I have some hue lights (rgb) working on homelynk.
I can change the color and brightness, and switch on off.

Now i have a hue filament White Ambiance color.
switching and brigtness works the same as an rgb.

only the color change doesn't work.
It is only diverent white colors to change.

Can somebody help me with a script.
thanks