Just a heads up, because it "stopped working" for me, in the new OS updates that came out yesterday/today, Siri now requires you to say lights when asking for color
before
"siri make the living room blue" - lights turn blue
now
"siri make the living room blue" - Siri says "sorry couldn't find anything like that in your home"
"siri make the living room lights blue" - lights turn blue
this seems to be the case across HomePod, iPhone, appleTV, Mac, and watch (on iOS/tvOS 14.3, OS X 11.1, watch OS 7.2)
before
"siri make the living room blue" - lights turn blue
now
"siri make the living room blue" - Siri says "sorry couldn't find anything like that in your home"
"siri make the living room lights blue" - lights turn blue
this seems to be the case across HomePod, iPhone, appleTV, Mac, and watch (on iOS/tvOS 14.3, OS X 11.1, watch OS 7.2)