How do I set Hue Light brightness, color etc?

[peejayw]

OK, sorry. I just have a simple Event:State that is triggered by a motion sensor, going to a Call Service that turns on my Hue light.
In the Call Service node, under Data I have "brightness": 255, and that works fine but when I try to set the color, "rgb_color": "165, 76, 255" I get an error "Call-service API error. Error Message: None for dictionary value @ data['rgb_color']"

I hope that makes sense, very new at this.
Thanks.