Thank you, thank you, thank you!!! I've used dimmer values for two lights to minimize the chances of accidentally making a scene with the same values.
I just have one more question: will the false (second) rule not be running all day, every day? Is that a bad thing? Should I make the second rule a triggered rule as well?
Color would not be so easy to add, since it is a compound device with multiple attributes. There would have to be Hue and Saturation as separate conditions. You'd have to show me a convincing use case that needs this and that overcomes the compound problem -- you couldn't just say "red". Color Temperature would be more straight forward, but again, what is the compelling use case?
I will leave that to you @pietsnot. I have been able to use dimmer level for all of my use-cases. Then again, I don't have all that many color or color temp bulbs either.