Sometimes technology amazes me because it’s impossible to do something simple - although I’m secretly hoping that someone can prove me wrong here!

I want to be able to automatically turn off a Hue light x minutes after it’s been put on manually. Ie my son turns his light on and leaves the room - after 15min it automatically turns itself off. I want this to happen whenever he turns the light on automatically.

I know I could do this with a Hue sensor but I don’t feel I should have to buy another sensor to do something this simple! Is that really so difficult?