Why can't I trigger something with a light color change?

Month of "What the heck?!"
1

From my limited understanding, the short answer is because Homeassistant listens for state changes, which is technically not what a color change would be. However, Homeassistant is what made the bulb change color so it certainly “knows” the color has changed.

2

Untested, but I’m reasonably sure you can.

trigger:
  platform: state
  entity_id: light.my_light
  attribute: rgb_color
3

Ugh. Thank you. :man_facepalming:

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