looks it is dashboard node? I haven't had any dashboard stuff on node-red yet, don't know how to make it work.
I ended up just send payload to a topic one by one, if I need 80% on red, in 2 steps, send payload 80 to topic bulb1/cmnd/dimmer, and send 255,0,0 to topic bulb1/cmnd/color. seems worked.
Is there way to send multiple payloads in one step?