Green, Yellow, Red lightstrip automation?

I have a DIY lightstrip running a zigbee controller that i was able to add into the hue app, and im also running blueyeti’s hue edge driver. Im wanting to create an automation that sets a 15 minute timer for my kids when they shower. Green for 10 minutes, yellow at the 5 minute mark, red with 1 minute remaining, then off. My impression was that I could do this by creating a scene for each color in the Hue app and then automate, but I’m not finding how to do that. Any ideas?

One possible solution if you can control lightstrip in ST

I am curious to find out what triggers the automation to start/end?