Get a sensor so it turns on when he is in the room but automatically turns on whenin the room, no movement will turn off you can set timers on it we did it for our bathroom might work for your sons room.
My daughter must get some bills and I’m not kidding I chuckled at this post but the guys right every light is on in my daughters house even during the day if kids are in especially the toilet one and the fans running as well I feel like taking them out I’m sick of turning switches off when I’m in her house I even done that before the energy rose but after I got my bill in after 7 weeks I was peanuts under £600s I’m extra careful so yes take that bulb out hey this has made my morning.
I did this last summer! My son kept having the light on when its a sunny bright day and then would leave it on when he left the room. I took the bulb out for a few weeks so he could realise he didn't need the light on because its not dark! He learnt and didn't do it again
Is this really a battle? If this is the only battle you have with your teenage son, I’d be thankful. Honestly change the bulb and hope he listens but you could have much bigger battles than that to come - save your energy.
I was just going to say dors he suffer from anxiety if his bedroom light is not on when he goes in? My 19 year old son won't sleep if he doesn't have his LED lighting on. Get a timer or smart light bulb so can control it from phone.
That’s not cruel at all actually. Can’t follow the rules? Well then you don’t get light! I'm sure he has a cell phone that has a flashlight he can use. It will teach him a lesson and inconvenience him, like the extra cost is inconveniencing you.