Are you trying to do this through a rule? Normally there’s a color picker available, but I think certain Philips Hue integrations in SmartThings aren’t reporting their data types properly in the next-gen SmartThings integration. It’s on my list to investigate and report to SmartThings (though I suspect it could also be something that gets resolved if the device is currently on a Groovy DTH which will transition to a driver).
That being said, if you were trying to do things manually or with variables, you can find some details on how to achieve this in the following thread:
The SmartThings setColor()
command expects a ‘COLOR_MAP’ parameter which is basically an object with ‘hue’ and ‘saturation’ values. Of particular note is that the hue
parameter is 0-100 in the SmartThings world.