Hi @doordewar;
I don’t know if I can help you but I tried to use the WAKE_LOCK to stop the brightness attenuation and refering to the batery and wich one is better, In my opinion the SCREEN_ON is better, because with the WAKE_LOCK even if you have your app on the background, your device wont go to stand by, but with the SCREEN_ON, if you are not using your app, the screen will go to sleep mode after a while.
Well, I don’t know much more about it, hope you find your answer 