After setting up action files to control hue, the system works in that the correct scene is triggered but at the same time it decides to turn on ALL the other lights in the hue bridge.

one of my action files is this.

#http://<hue-bridge-ip>/api/<hue-bridge-user>/groups/<hue-light-group>/action

#PUT:{"on":true,"scene":"<scene ID>","transitiontime":50}

http://192.168.50.84/api/LoWDA87uRChjxIaomijXXakCDg7JZxXSUirPD58/groups/Kodi/action

PUT:{"on":true,"scene":"3A0VwVI5aWe5AELi","transitiontime":50}

Definitely right and as I say triggers the scene off, but also whacks all lights with it.

is it something to do with APIV2?

Many thanks

Alas! after much perseverance…. I have cracked it. needed a different line but all good now. Also read the other full guide on here again and again.

Read, code, test, repeat, read, code, test, rep….

Anyways, I have solved it!