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I was responding to another post regarding Twitter who compared those two. And no I don't claim to know some inside facts. I just find it hard to believe it draws that much more energy. I never noticed any degradation of the low power mode feature in earlier betas when I also had night mode enabled.

I use NightShift 24 (well, 23 hours and 59 minutes) a day and haven't had any problems with battery times.
 
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