How do you think a color is generated?
These are the capabilities which are available, and from them, of course, the color is generated:
These values are stored with Zone Memory, already mentioned and explained by the developer of Zone Memory @Shakesbeard in this thread. Also mentioned, that there could be some problems with the Philips Hue app and Zone Memory.
Btw, I don’t understand why you want to use Zone Memory when it’s possible to set Philips Hue scenes via Athom’s Philips Hue app (I assume you use this app) afaik.
