If you are concerned about you AOD being too bright that it will be consuming too much of your battery capacity, you have a few simple options:
1. Turn it completely off in the Display settings.
2. Place it on a schedule to only work at night when you may want to use as a clock next to your bed.
3. Place your phone face down when you aren't using your phone. The AOD will automatically turn off.
4. Put the phone in a pocket, purse, drawer, or in a holster with the screen facing inward, and the AOD will turn off. Removing your phone from any of these to check the time, notifications, etc, and your display automatically turns back on.
I keep my N8 in a holster. I like that when I remove, it my AOD is bright enough to see under any lighting conditions.
(My wife's LgG6 has an AOD that is way too dim, IMO, to easily see even at night.)