Lolol. Where did you get that from friend? I've never seen that stipulated ANYWHERE! I use my device usually below 40% as above that it gets very harsh on the eyes especially at night and I don't plan to sear my retinas. Screen on time is just that, the time you get with the screen on, the brightness is irrelevant, but since it affects the numbers it's usually quoted. By your standard almost no one should report their screen on time as most people don't use their devices at 100% brightness constantly.